Tag Archives: Sikorsky Aircraft Corporation

1 October 1947

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A Los Angeles Airways Sikorsky S-51 helicopter takes off from the roof of the Terminal Annex Post Office, 1 October 1947. The Los Angeles Times published this photograph 2 October 1947 with the following caption: “NEW MAIL SERVICE — Los Angeles Airways helicopter shown landing on the roof of Terminal Annex Post office yesterday to inaugurate helicopter air-mail service, the first of its kind in the United States. Two flights daily are planned on this run with another to start Oct. 16.” (Los Angeles Times Photographic Archive/UCLA Library)

1 October 1947: Los Angeles Airways began regularly scheduled air mail service in Los Angeles, using the Sikorsky S-51 helicopter.

“. . . the U.S. Civil Aeronautics Board awarded LAA the route authorities to operate local air mail services in Southern California using the Sikorsky S-51. Before long, LAA was operating a twice-a-day mail service between the main downtown post office and Los Angeles International Airport along with a small package air express service.

“With a fleet of five S-51s, LAA’s first year of operations resulted in 700 tons of mail being carried with approximately 40,000 landings throughout the Los Angeles metropolitan area. The small operation maintained a 95% reliability rate and by the time it began its small package air express service in 1953, it was annually moving nearly 4,000 tons of mail a year.

“In July 1951 the CAB awarded LAA’s reliable helicopter operation the rights for passenger services which started in November 1954 with larger Sikorsky S-55 helicopters while the smaller S-51s continued the mail and small package services. . . .”

— Tails Through Time, http://aviationtrivia.blogspot.com/2010/06/on-1-october-1947-los-angeles-airways.html

The S-51 was a commercial version of the Sikorsky R-5 series of military helicopters. It was a four-place, single-engine helicopter, operated by one pilot. The cabin was built of aluminum with Plexiglas windows. The fuselage was built of plastic-impregnated plywood, and the tail boom was wood monocoque construction. The main rotor consisted of three fully-articulated blades built of metal spars and plywood ribs and covered with two layers of fabric. (All metal blades soon became available.) The three bladed semi-articulated tail rotor was built of laminated wood. The main rotor turned counter-clockwise, as seen from above. (The advancing blade is on the helicopter’s right.) The tail rotor was mounted on the helicopter’s left side in a pusher configuration. It turned clockwise as seen from the helicopter’s left.

The helicopter’s fuselage was 41 feet, 7.5 inches (12.687 meters) long. The main rotor had a diameter of 48 feet (14.630 meters) and tail rotor diameter was 8 feet, 5 inches (2.565 meters), giving the helicopter an overall length of 57 feet, 1 inch (17.399 meters). It was 13 feet, 1.5 inches (4.001 meters) high. The landing gear tread was 12 feet (3.7 meters). The S-51 had an empty weight of 4,050 pounds (1,837 kilograms) and maximum takeoff weight of 5,500 pounds (2,495 kilograms). Fuel capacity was 100 gallons (378.5 liters).

The helicopter was powered by an air-cooled, supercharged, 986.749-cubic-inch-displacement (16.170 liter) Pratt & Whitney Wasp Jr. T1B4 (R-985 AN-5) direct-drive, nine-cylinder radial engine which was placed vertically in the fuselage behind the crew compartment. This engine was rated at 450 horsepower at 2,300 r.p.m., Standard Day at Sea Level. The R-985 AN-5 was 48.00 inches (1.219 meters) long, 46.25 inches (1.175 meters) in diameter and weighed 684 pounds (310.3 kilograms) with a magnesium crankcase.

The S-51 had a maximum speed (Vne) of 107 knots (123.1 miles per hour/198.2 kilometers per hour). Range was 275 miles (442.6 kilometers). The service ceiling was 14,800 feet (4,511 meters). The absolute hover ceiling was 3,000 feet (914.4 meters).

Of 220 helicopters in the S-51 series built by Sikorsky, 55 were commercial models.

Los Angeles Airways Sikorsky S-51 (Viewliner)
A Los Angeles Airways Sikorsky S-51. The main rotor hub is covered. (Viewliner)

© 2016, Bryan R. Swopes

27 September 2008

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Sikorsky MH-53M Pave Low IV, 68-8284, “Cowboy 26,” prepares for its final combat mission, Iraq, 27 September 2008. (A1C Jason Epley, U.S. Air Force)

27 September 2008: A United States Air Force Sikorsky MH-53M Pave Low IV special operations helicopter, serial number 68-8284, assigned to the 20th Expeditionary Special Operations Squadron, flew its final combat mission before being withdrawn from service and retired after 40 years and 12,066.6 flight hours.

“Cowboy 26” was flown by Major Philip Cooper, Captain Peter Hettinger, and Colonel Scott Howell, with Technical Sergeant Henry Woodie, Staff Sergeant Shawn Lewis, Senior Airman Eric Harp, and Airman 1st Class Joshua Lucas.

68-8284 was built by the Sikorsky Aircraft Corporation at Bloomfield, Connecticut, as one of 40 HH-53C Super Jolly Green Giants for Combat Search and Rescue (CSAR). It was delivered to the Air Force in August 1968. 68-8284 was assigned to the 40th Air Rescue and Recovery Squadron  at Nakhon Phanom Royal Thai Air Force Base, 1971–1972. It operated as “Jolly Green 55.”

On 5 September 1971, with flight crew Major Jerry R. Thompson, Gary L. Gamble (CP),  FE Raymond Duarte and PJs William D. Brinson and Michael D Vogele, it rescued the survivors of “Knife 33,” a 21st SOS CH-3E that went down in Laos. On 19 December 1971 (Capt Harold O. Jones (P), David G. Daus (CP), FE Jerrold T. Dearmans, with PJs Leon Fullwood and William D. Brinson, the crew of Falcon 74, a 13th TFS/432 TFW F-4D Phantom II which had gone down shot down 17 December by a SAM near Ban Poung Ban in northeastern Laos. Maj. William T. Stanley, Capt. Lester O’Brien were safely recovered.

A U.S. Air Force Sikorsky HH-53C Super Jolly Green Giant hovers to hoist a pararescueman with one downed pilot, while a second waits on the ground, 16 June 1967. The blade tip vortices are visible because of the high humidity. (This image has been reoriented and cropped from the original photograph.) (National Archives at College Park)

8284 was later assigned to the 67th Aerospace Rescue and Recovery Squadron (39th Aerospace Rescue and Recovery Wing) at RAF Woodbridge, Suffolk, England. 68-8284 has been constantly modernized and upgraded. It was initially converted to the MH-53J Pave Low III/Enhanced configuration by the Naval Air Rework Facility, NAS Pensacola, Florida, in the late 1980s. The helicopter was further modified to the MH-53M Pave Low IV configuration at the Naval Air Depot, MCAS Cherry Point, North Carolina.

The MH-53M Pave Low IV is designed for operations in darkness. (Staff Sergeant Aaron Allmon, U.S. Air Force) 080927-F-7823A-433

The MH-53M Pave Low IV is a variant of Sikorsky’s S-65 heavy-lift military transport helicopter series.  The MH-53M is a single main rotor, single tail rotor, twin-engine helicopter. It has a crew of six: 2 pilots, 2 flight engineers and 2 gunners. The Pave Low IV is equipped with Terrain-Following Radar and Forward Looking Infrared (FLIR) for low-level operations in darkness and low visibility.

The MH-53M fuselage is 67 feet, 2.4 inches (20.483 meters) long, and the helicopter has a maximum length of 91 feet, 11.34 inches (28.025 meters) with rotors turning and the refueling boom extended. The height to the top of the main rotor pylon is 17 feet, 1.68 inches (5.224 meters). The maximum height (rotors turning) is 24 feet, 10.88 inches (7.592 meters).

Sikorsky HH-53C 3-view illustration with dimensions. (Sikorsky Historical Archives)

The fully-articulated 6-blade main rotor has a diameter of 72 feet, 2.7 inches (22.014 meters). The main rotor turns counter-clockwise at 185 r.p.m. (100% Nr), as seen from above. (The advancing blade is on the helicopter’s right.) The main rotor blades are built with titanium spars and have -16° of twist. The semi-articulated four-blade tail rotor has a diameter of 16 feet, 0 inches (4.877 meters) and is positioned on the left side of the tail pylon. It turns clockwise at 792 r.p.m., as seen from the helicopter’s left side. (The advancing blade is below the axis of rotation.) The gap between rotor arcs is just 4.437 inches (11.270 centimeters).

Empty, the MH-53M weighs 32,000 pounds (14,515 kilograms). Its maximum takeoff weight is 46,000 pounds (20,865 kilograms).

Its two General Electric T64-GE-100 axial-flow turboshaft engines have a Normal Continuous Power rating of 3,810 shaft horsepower at 85 °F. (30 °C.), Military Power rating of 4,090 shaft horsepower, and a Maximum Power rating of 4,330 shaft horsepower. The T64-GE-100 is 79 inches (2.007 meters) long, 20 inches (0.508 meters) in diameter and weighs 720 pounds (327 kilograms). Output (100% N2) is 13,600 r.p.m.

Two Sikorsky HH-53C Super Jolly Green Giants of the 39th Aerospace Rescue and Recovery Wing fly in formation over Goose Bay, Canada, 11 June 1978. 68-8284 is the ship closest to the camera, painted gray. (TSgt. Robert C. Leach/U.S. Air Force)
Two Sikorsky HH-53C Super Jolly Green Giants of the 39th Aerospace Rescue and Recovery Wing fly in formation over Goose Bay, Labrador, Canada, 11 June 1978. 68-8284 is the ship closest to the camera, painted gray. (TSgt. Robert C. Leach/U.S. Air Force)

The MH-53M has a maximum speed of 196 miles per hour (315 kilometers per hour) and a service ceiling of 16,000 feet (4877 meters). It carries two 450-gallon (1,703 liter) jettisonable fuel tanks under each sponson.

The MH-53M is armed with two M134 7.62mm miniguns and a GAU-18/A .50 caliber machine gun.

A Sikorsky MH-53J Pave Low III Enhanced from the 16th Special Operations Wing ready to refuel from a Lockheed MC-130E Combat Talon, 21 October 2001, classified location Operation Enduring Freedom. (TSGT Scott Reed, USAF) U.S. National Archives 6523525

At the time they were retired, the MH-53Ms were the fastest, heaviest, most powerful helicopters in the United States Air Force inventory.

After leaving Iraq, 68-8284 was transported by C-17 Globemaster III to England. It was loaned to the Royal Air Force Museum Cosford, where it is on display.

Sikorsky MH-53M Pave Low IV 68-8284 with another Pave Low IV on their final mission . 27 September 2008. (U.S. Air Force 080927-F-7823A-409)

Recommended: On a Steel Horse I Ride: A History of the MH-53 Pave Low Helicopters in War and Peace, by Darrel D. Whitcomb. Air University Press, Air Force Research Institute, Maxwell Air Force Base, Alabama, September 2012.

© 2019, Bryan R. Swopes

1 September 1953

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Sabena Sikorsky S-55 OO-SHA (Sabena)

1 September 1953: The Societé Anonyme Belge d’Exploitation de la Navigation Aérienne (SABENA) began scheduled international passenger service flying the Sikorsky S-55, a commercial variant of the military H-19 Chickasaw. It carried 8 passengers.

SABENA advertisement

For just over three years, since 21 August 1950, SABENA flew mail from Brussels to Antwerp, Liege, and Turnhout using the Bell Model 47D-1.

The Sikorsky Aircraft Corporation S-55 was flown by two pilots in a cockpit placed above the passenger/cargo compartment. The most significant design feature was moving the engine from directly under the main rotor mast to a position at the front of the helicopter. Installed at an angle, the engine turned a drive shaft to the main transmission. The engine placement provided space for a large passenger/cargo compartment. The aircraft was constructed primarily of aluminum and magnesium, with all-metal main and tail rotor blades.

Cutaway drawing of the Sikorsky S-55/H-19/HO4S/HRS. Note the rearward-facing, angled placement of the radial engine.(Sikorsky Historical Archives)

The main rotor consisted of three fully-articulated blades built of hollow aluminum spars, with aluminum ribs. Spaces within the blade were filled with an aluminum honeycomb. The blades were covered with aluminum sheet. The hollow spars were filled with nitrogen pressurized to 10 p.s.i. An indicator at the blade root would change color if nitrogen was released, giving pilots and mechanics an indication that the spar had developed a crack or was otherwise compromised. The main rotor turned counter-clockwise as seen from above. (The advancing blade is on the helicopter’s right.) Flapping hinges were offset from the main rotor axis, giving greater control response and effectiveness. The tail rotor was mounted on the helicopter’s left side in a pusher configuration. It turned clockwise as seen from the helicopter’s left.

The helicopter’s fuselage was 42 feet, 2 inches (12.852 meters). The main rotor had a diameter of 53 feet (16.154 meters) and tail rotor diameter was 8 feet, 8 inches (2.642 meters), giving the helicopter an overall length with all blades turning of 62 feet, 2 inches (18.948 meters). It was 13 feet, 4 inches (4.064 meters) high. The landing gear tread was 11 feet (3.353 meters). The S-55 had an empty weight of 4,785 pounds (2,173 kilograms) and maximum takeoff weight of 7,200 pounds (3,271 kilograms). Fuel capacity was 185 gallons (698 liters).

The S-55’s large clam shell doors provided excellent access to the engine.

The S-55 commercial helicopter and H-19/HO4S and HRS military variants used an air-cooled, supercharged 1,301.868-cubic-inch (21.334 liter) Wright Aeronautical Division 871C7BA1 Cyclone 7 (R-1300-3) 7-cylinder radial engine with a compression ratio of 6.2:1. The R-1300-3 was also a direct-drive engine, but was rated at 700 horsepower at 2,400 r.p.m., Normal Power, and 800 horsepower at 2,600 r.p.m. for Take-Off. The engine incorporated a large cooling fan to circulate air around the cylinders. The R-1300-3 was 49.68 inches (1.261 meters) long, 50.45 inches (1.281 meters) in diameter, and weighed 1,080 pounds (490 kilograms).

SABENA Sikorsky S-55 OO-SHF. (Mike Hooks/Avia Deja Vu)

© 2018, Bryan R. Swopes

14 August 1968

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Sikorsky S-61L N300Y, Los Angeles Airways, at Disneyland Heliport, Anaheim, California. (Robert Boser)
Sikorsky S-61L N300Y, Los Angeles Airways, at Disneyland Heliport, Anaheim, California. (Robert Boser)

14 August 1968: At 10:28:15 a.m., Pacific Daylight Time, Los Angeles Airways Flight 417, a Sikorsky S-61L helicopter, departed Los Angeles International Airport (LAX) on a regularly-scheduled passenger flight to Disneyland, Anaheim, California. On board were a crew of three and eighteen passengers. The aircraft commander, Captain Kenneth L. Waggoner, held an Airline Transport Pilot certificate and was type-rated in the Sikorsky S-55, S-58 and S-61L. He had a total of 5,877:23 flight hours, with 4,300:27 hours in the S-61L. Co-pilot F. Charles Fracker, Jr. had 1,661:18 flight hours, of which 634:18 were in the S-61L. Flight Attendant James A. Black had been employed with LAA for nearly ten years.

At approximately 10:35 a.m., while flying at an estimated altitude of 1,200–1,500 feet (370–460 meters) above the ground, one of the helicopter’s five main rotor blades separated from the aircraft which immediately went out of control, started to break up, and crashed in a recreational park in Compton. All twenty-one persons on board, including the 13-year-old grandson of the airlines’ founder and CEO, were killed.

The Sikorsky S-61 was registered N300Y.  It had been the prototype S-61L, serial number 61031. Los Angeles Airways was the first civil operator of the S-61, purchasing them at a cost of $650,000 each. As of the morning of 14 August 1968, 61031 had accumulated a total of 11,863.64 hours flight time on the airframe (TTAF). It flew an estimated 3.17 hours on the morning of the accident.

Los Angeles Airways’ Sikorsky S-61L N300Y. Los Angeles City Hall is at the bottom of the image, just left of center. (AirHistory.net)

The Sikorsky S-61L was a civil variant of the United States Navy HSS-2 Sea King, and was the first helicopter specifically built for airline use. The prototype, N300Y, first flew 2 November 1961. It is a large twin-engine helicopter with a single main rotor/tail rotor configuration. Although HSS-2 fuselage is designed to allow landing on water, the S-61L is not amphibious, having standard fixed landing gear rather than the sponsons of the HSS-2 (and civil S-61N). The S-61L fuselage is 4 feet, 2 inches (1.270 meters) longer than that of the HSS-2. The S-61L is 72 feet, 7 inches (22.123 meters) long and 16 feet, 10 inches (5.131 meters) high, with rotors turning.

The main rotor has five blades and a diameter of 62 feet (18.898 meters). Each blade has a chord of 1 foot, 6.25 inches (0.464 meters). The tail rotor also has five blades and a diameter of 10 feet, 4 inches (3.149 meters). They each have a chord of 7–11/32 inches (0.187 meters). At 100% r.p.m., the main rotor turns 203 r.p.m. and the tail rotor, 1,244 r.p.m. The main rotor turns counter-clockwise, as seen from above. (The advancing blade is on the helicopter’s right side.) The tail rotor turns clockwise, as seen from the left side. (The advancing blade is below.)

The S-61L was powered by two General Electric CT58-140-1 turboshaft engines, each of which was rated for 1,400 shaft horsepower for takeoff and maximum power of 1,500 shaft horsepower for 2½ minutes. The main transmission was rated for 2,300 horsepower, maximum.

The S-61 has a cruise speed of  166 miles per hour (267 kilometers per hour).  The service ceiling is 12,500 feet (3,810 meters). 61031 had a maximum takeoff weight (MTOW) of 19,000 pounds (8,618.3 kilograms).

Between 1958 and 1980, Sikorsky built 794 S-61 series helicopters. 13 were S-61Ls.

Crash scene of Los Angeles Airways’ Sikorsky S-61L N300Y. (Benjamin John Olender/Los Angeles Times, Vol. LXXXVII,Thursday, 15 August 1968, Page 3, Columns 1–4)

The National Transportation Safety Board investigation found that most of the helicopter was contained with a small area of Leuders Park. One main rotor blade, however, was located approximately 0.25 miles (0.40 kilometers) west of the main wreckage. This blade is referred to as the “yellow” blade. (The main rotor blades marked with colored paint for simplicity, red, black, white, yellow, and blue.) Analysis found that this blade’s spindle, where it attached to the main rotor hub assembly, had failed due to a fatigue fracture. It was believed that the fracture began in an area of substandard hardness which was present in the original ingot from which the part was forged, and that inadequate shot-peening of the part during the overhaul process further weakened the spindle.

Diagram of fractured main rotor spindle. (NTSB)
Diagram of fractured main rotor spindle. (NTSB)

Los Angeles Airways had experienced a similar accident only three months earlier which had resulted in the deaths of all 23 persons on board. (Flight 841, 22 May 1968). L.A. Airways never recovered from these accidents and ceased all operations by 1971.

© 2016, Bryan R. Swopes

3 July 1951: Medal of Honor, Lieutenant (j.g.) John Kelvin Koelsch, United States Navy

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Lieutenant (Junior Grade) John Kelvin Koelsch, United States Navy.
Medal of Honor Citation for Lt. (j.g.) John K. Koelsch, U.S.Navy. (National Archives)

3 July 1951: With his Chance Vought F4U-4B Corsair, Bu. No. 63056, hit and on fire, Captain James V. Wilkins, United States Marine Corps, of Marine Fighter Squadron 312 (VMF-312) stationed aboard USS Sicily (CVE-118), bailed out approximately 35 miles (56 kilometers) southeast of Wonson, North Korea. He parachuted onto a mountainside in the Anbyon Valley.

Severely burned and with an injured leg, Captain Wilkins was seen by North Korean soldiers along a heavily-traveled supply route. While enemy soldiers shot at him, Wilkins tried to escape by crawling up the mountainside.

A U.S. Marines F4U Corsair of VMF-312 about to land aboard an aircraft carrier during the Korean War. This is the same type fighter flown by Captain. J.V. Wilkins on 3 July 1951. (U.S. Navy)
A U.S. Marines F4U Corsair of VMF-312 about to land aboard an aircraft carrier during the Korean War. This is the same type fighter flown by Captain James V. Wilkins on 3 July 1951. (U.S. Navy)

Lieutenant (j.g.) John Kelvin Koelsch, United States Navy, was a helicopter pilot in charge of a detachment of Helicopter Utility Squadron Two (HU-2), stationed aboard a former U.S. Navy Landing Ship (Tank), USS LST-488. The LST had been transferred to Japan after World War II and converted to a merchant ship. During the Korean War, it and its 45-man Japanese crew were contracted to the U.S. Navy. The LST was reconverted to a helicopter support ship, designated Q-009.

A torpedo bomber pilot during World War II, Lieutenant Koelsch transferred to Helicopter Utility Squadron One (HU-1) at NAS Lakehurst, New Jersey, in 1949, and was trained to fly the Sikorsky HO3S-1 helicopter, a Navy variant of the commercial Sikorsky S-51. He had completed a combat tour aboard USS Princeton (CV-37) but rather than return to the United States with his squadron, requested a transfer to HU-2. Koelsch told his shipmates that he felt rescuing downed pilots was his mission.

A U.S. Navy Sikorsky HO3S-1, possibly Bu. No. 122715, rescues a downed flyer from Wonson Harbor, 1951. (Sikorsky Historical Archives)
A U.S. Navy Sikorsky HO3S-1, possibly Bu. No. 122715, rescues a downed flyer from Wonson Harbor, 1951. (Sikorsky Historical Archives)

When Captain Wilkins’ Corsair went down, Lieutenant Koelsch volunteered to attempt a rescue. Shortly before sunset, he and his rescue crewman, Aviation Machinist’s Mate 3rd Class George Milton Neal, boarded their helicopter, Sikorsky HO3S-1, Bu. No. 122715, and took off from Q-009 in a mist and low clouds.

Lieutenant Koelsch's Sikorsky HO3-S-1 helicopter, Bu. No. 122715, aboard USS Phillipine Sea (CV-47). (U.S. Navy)
Lieutenant Koelsch’s Sikorsky HO3-S-1 helicopter, Bu. No. 122715, aboard USS Philippine Sea (CV-47). (U.S. Navy)

Wilkins heard Koelsch’s helicopter approaching and moved back down the mountain toward his parachute. He saw the Sikorsky flying at about 50 feet (15 meters) below a layer of clouds. The helicopter was receiving heavy ground fire from the North Korean soldiers along the road. The Sikorsky was hit and Koelsch turned away, but he quickly returned. Koelsch located Wilkins and brought the HO3S-1 to a hover while rescue crewman Neal lowered a “horse collar” harness on a hoist cable. Neal then lifted the fighter pilot up to the helicopter.

The helicopter continued to be targeted by ground fire and it was finally shot down. 122715 crashed on the mountainside and rolled upside down. Koelsch and Neal were unhurt and Wilkins suffered no new injuries. Koelsch and Neal carried Wilkins and they moved away from the enemy forces, heading toward the coast. The three Americans evaded the enemy for nine days before they were captured.

John Koelsch refused to cooperate with his captors. He was held in isolation and subjected to torture. He soon became very ill. Just three months after being captured, Lieutenant (j.g.) John Kelvin Koelsch died. For his actions during and after 3 July 1951, he was awarded the Medal of Honor.

Captain Wilkins and AM3 Neal survived the war and were eventually returned to the United States. George Milton Neal was awarded the Navy Cross.

In 1965, the Garcia-class destroyer escort USS Koelsch (DE-1049, later classified as a frigate, FF-1049, in 1975) was christened in honor of the first helicopter pilot to be awarded the Medal of Honor.

USS Koelsch (FF-1049). (U.S. Navy)
USS Koelsch (FF-1049), a Garcia-class frigate, 21 May 1979. (U.S. Navy)

John Kelvin Koelsch was born 22 December 1923 in the family home at 2 Draycott Place, Chelsea (a borough in the southwest part of  London, England). He was the third son of Henry August Koelsch and Beulah Anne Hubbard Koelsch. Mr. Koelsch was an American banker. The family returned to America aboard White Star liner R.M.S. Adriatic, sailing from Liverpool on 26 April 1924, and arriving at the Port of New York on 5 May.

In America, the Koelsch family lived in Briarcliff Manor, Westchester County, New York.

John K. Koelsch enlisted as an aviation cadet in the United States Navy 14 September 1942. He was trained as a pilot. When qualified as a Naval Aviator, Koelsch was commissioned as an ensign, 16 October 1944. He was promoted to the rank of lieutenant (junior grade) 1 August 1946.

Following the Korean Armistice Agreement, Lieutenant Koelsch’s remains were returned to the United States and interred at Arlington National Cemetery, 14 October 1955.

© 2018, Bryan R. Swopes