United States Air Force - USAF (since 1947)

Shot down by the pilots of Soviet AF MiG-15 and crashed about 40 km north of Pyongyang. It is believed that seven crew members were killed while five others became POW.
Crew:
1st Lt Harold Copland,
M/Sgt Patrick M. Differ, †
1st Lt Robert R. Foster, †
2nd Lt David T. Heer, †
A1c Rudolf Nikles, †
A2c Damian F. O'Toole, †
1st Lt Otho A. Orr,
1st Lt Harry M. Rehm, †
A2c Daryl E. Rodney, †
A2c Donald G. Swalls,
A2c Leland H. Van Slyke,
1st Lt Paul I. Wilcox.

Last radio contact at 1835LT then disappeared without trace.
Crew:
1st Lt Norman E. Bowen,
1st Lt Howard A. Hayes,
A1c Daniel Jack,
Cpt Ernest C. Swanson.

Inbound from Korea, the crew was descending to Tachikawa AFB when the aircraft crashed in unknown circumstances into the Tokyo Bay. The aircraft was lost and all four crew members were rescued.

The aircraft was performing a flight from Korea with veterans on board flying back home for Christmas holidays. On behalf of the Tactical Air Command, the four engine airplane was scheduled to make enroute stops in Larson AFB, Washington, Kelly AFB, Texas, Tennessee and South Carolina with Florida as its final destination. The takeoff from Larson AFB was started in light snow conditions. After liftoff, while climbing to a height of 100 feet, the aircraft banked left, causing the left wing to hit the ground. Out of control, the aircraft crashed in a huge explosion in a field located past the runway end. Five crew members and 82 passengers were killed while 28 other occupants were injured. The aircraft was destroyed. At the time it occurred, this accident was the deadliest in aviation history.
Crew list and details:
http://www.koreanwar-educator.org/topics/airplane_crashes/globemaster_larson/p_globemaster.htm

Crashed in unknown circumstances in a mountainous area located 30 km north of Guercif.

The takeoff roll was abandoned for unknown reason. Unable to stop within the remaining distance, the aircraft overran and came to rest. A pilot was killed while the second occupant was injured.
Crew:
A1c Thomas J. Condron, †
1st Lt Abner L. Wilkerson.

While overflying a mountainous area located south of Wells, the crew encountered extreme turbulences and severe downdrafts. The aircraft lost height and eventually hit the east slope of Mt East Humbold, about 13 miles southwest of Wells. All six occupants were killed.

Shot down by antiaircraft fire and crashed. No trace of the three crew members was found. Last radio contact at 2134LT.
Crew:
Mike B. Alexander,
Maj Theodore H. Kuch Jr.,
Clarence Mosley.

While cruising in marginal weather conditions on a flight from Offutt AFB to March AFB, the airplane hit the slope of Mt San Gorgonio located about 29 miles northeast of March AFB. The wreckage was spotted few hours later and all 13 occupants have been killed. Four days later, a US Marine Corps' Sikorsky crashed in the same area while taking part to the rescue operations, killing two of its three crew members.

Crash landed.