United States Air Force - USAF (since 1947)

The crew started the descent to Recife-Guararapes Airport by night when at an altitude of 1,890 feet, the four engine aircraft struck the slope of a mountain located some 80 km northwest of Recife. The wreckage was found few hours later and all 10 crew members were killed.

While engaged in a dropping mission, the airplane was flying at low height and reduced speed when it stalled, struck trees and crashed in a wooded area. Two crew members were killed while two others were injured.
Those killed were:
Cpt Kenneth James Hoffman,
A1C Gary Raymond McKendrick.

After touchdown on an airbase located somewhere in South Vietnam, the airplane went out of control, veered off runway and collided with a parked helicopter. There were no casualties but the aircraft was destroyed.

Shortly after takeoff from Katum Airfield, the airplane was hit by enemy fire. The pilot decided to divert to Tây Ninh Airfield for an emergency landing when the engine number one caught fire. It was shot down and its propeller was feathered. Upon landing, the left wing was on fire and the left main gear still retracted. The airplane came to rest and was later destroyed by fire while all five crew members escaped uninjured.

On final approach to Đắk Tô Airfield, the airplane was hit by enemy fire, stalled and crashed in flames short of runway threshold. All 30 occupants were rescued while the aircraft was destroyed.

The crew was engaged in an aerial attack of a Viêt Cong camp located at Xóm Rach Tàu, at the extreme south coast of South Vietnam. While cruising at low height, the airplane was hit by enemy fire. The left engine and the left wing caught fire and the crew elected to evacuate the area when the airplane went out of control and crashed into the sea few km offshore. All three crew members were killed.
Crew:
Lt Col Emmet Rucker,
Maj James L. Shanks,
Sgt Herbert E. Schmidt.

On final approach to Bedford-Hanscom Field AFB, the crew failed to realize his altitude was too low when the airplane struck trees, stalled and crashed in flames in a wooded area located less than a mile from the runway threshold. All three crew members were seriously injured and the aircraft was destroyed by a post crash fire.

The aircraft was engaged in a flare mission over south Laos when it crashed in a huge explosion in the jungle. All nine crew members were killed and the exact circumstances of the crash was not determined. It may be possible the aircraft was shot down by enemy fire but this was not proven.
Crew:
Lt Col William Henderson Mason,
Cpt Thomas Barry Mitchell,
Maj Jerry Lee Chambers,
Cpt William Thomas McPhail,
S/Sgt Calvin Charles Glover,
Sgt Gary Pate,
A1C John Quincy Adam,
A1C Thomas Edward Knebel,
A1C Melvin Douglas Rash.

On final approach to Sông Bé Airfield, one of the engine failed for unknown reason. The airplane stalled and crashed in flames short of runway. All seven crew members escaped while the aircraft was destroyed.

Shortly after takeoff from Khâm Đức Airfield, while in initial climb, the aircraft was shot down by North-Vietnamese soldiers who were conducting an assault of the airbase. The aircraft went out of control and crashed in a huge explosion some 4 km east of the airfield. All 155 occupants, South-Vietnamese soldiers with their wife and children, were killed. Up to date, this was the worst crash by the USAF and the worst in Vietnam.
Crew:
Maj Bernard Ludwig Bucher,
1st Lt Stephan Craig Moreland,
S/Sgt Frank Monroe Hepler,
A1C George Wendell Long,
Maj John Lee McElroy,
Cpt Warren Robert Orr (was among the passenger).