Vietnam

The twin engine aircraft crashed in unknown circumstances while flying in bad weather conditions. All 10 occupants were killed, among them two Generals, three Colonels and three commanding officers who were conducting an inspection of the South Korean troops engaged in the Vietnam War.

Shortly after takeoff from Saigon-Tan Son Nhat Airport, while climbing, an engine failed and caught fire. The pilot lost control of the airplane that crashed in a huge explosion. Six of the 10 occupants were killed. At the time of the accident, the airplane was carrying a load of ammunitions.
Those killed were:
Lt Col Bernard Richard Knapic,
Maj Moses Lopes Alves,
Maj Jerome James Rice,
Cpt John Hooper V. Hathaway,
S/Sgt Ellsworth Smith Bradford,
S/Sgt Abraham Lincoln Moore.

Shortly after takeoff from Kien Giang, while in initial climb, the airplane banked sharply to the left and crashed, killing all five crew members.
Crew:
Cpt William F. Unckrich,
1st Lt Charles Franklin Burrell,
T/Sgt Harry Clifton Shepard,
S/Sgt Lavoyn Augustus Jones,
A1C Leland Craig Johnson.

Prong 33 took off from Phù Cát on the afternoon of the 8th on a planned seven-hour RDF mission. However, just 20 minutes after take off the pilot radioed that he was returning to base because of a problem with the doppler navigation equipment. The aircraft landed safely and although the doppler was fixed, the aircraft weather radar was found to be unusable. Despite bad weather in the flight area, the pilot was told to take off again but to return before dark if the weather worsened. When the aircraft reached its intended area or operations it was found that the weather was too bad to operate safely sot 1st Lt Knight flew towards the coast to return to Phù Cát. The pilot was guided through bad weather towards Phù Cát by the GCA controller but during the approach, 1st Lt Knight reported an inverter fire followed by the loss of his gyros and attitude indicators. The GCA controller gave instructions to direct the aircraft to the airfield but radio and radar contact was lost during the approach. Search operations were hampered by bad weather and it was not until 12 October that the wreckage was located by a SAR helicopter about 15 miles southeast of Phù Cát. All six crew members were killed.
Crew:
1st Lt Ronald Harold Knight,
1st Lt Max Emmanuel Rosen,
Cpt Bradley Rogers Ransom,
T/Sgt Sylvester William Redman,
S/Sgt Elmore L. Hall,
S/Sgt Michael L. Stiglich.
Source. Chris Hobson

While flying in the vicinity of Chu Lai, the airplane exploded in mid-air and crashed in a field, killing all five crew members.
Crew:
Maj Robert Hayes,
Cpt Bruce Cardy,
1st Lt Wendell Curry,
S/Sgt Isaac Corbett,
S/Sgt Norman Sweat.

The Greyhound was completing a troop transfer from Subi Point, Philippines, to the USS Constellation aircraft carrier. While approaching the navy ship, the airplane went out of control, dove into the sea and disintegrated on impact. Quickly on the scene, about 15 km from the ship, rescuers found some debris floating on water and an oil slick. None of the 26 occupants survived the crash.
Crew:
Lt Herbert Hugh Dilger,
Lt Richard Allen Livingstone,
P03 Paul Kierstead Moser,
P03 Michael James Tye,
P03 Rayford Jerome Hill.

On final approach to Pleiku Airport, one of the engine failed. The airplane stalled and crashed in flames short of runway threshold. All eight occupants were rescued while the aircraft was destroyed.

Following an uneventful flight from Saigon via Pleiku, the crew started the descent to Đà Nẵng in marginal weather conditions. The visibility was relatively limited due to clouds. On final, the DC-4 was cleared to land on runway 17L. At the same time, the crew of a USAF F4E Phantom II registered 67-0393 was approaching runway 17R when he was contacted by ATC and also cleared to land. The crew of the DC-4 understood this message was dedicated to him so the captain made a turn to the right to join the runway 17R approach path. Doing so in limited visibility, he failed to see the Phantom that was approaching from his right side. Both airplane collided and while the Phantom was able to land, the Skymaster entered a dive and crashed in a huge explosion in a rice paddy field located about three km from the runway threshold. Two passengers were seriously injured while 75 other occupants and two people on the ground were killed. Two other people working in the field were also injured.

While approaching Plei Djereng on a flight from Phù Cát, the airplane was shot down by small arms fire and crashed. All four crew members were killed.
Crew:
1st Lt Robert Paul Wiesneth,
1st Lt Neil Norman Greinke,
1st Lt Charles Brent Ross,
S/Sgt Frederick Wilhelm.

The crew departed Biên Hòa on a night mission to assist friendly troops. When it arrived on site, it was hit by enemy fire in the starboard wing. Out of control, it crashed in flames, killing all eight crew members.
Crew:
Cpt Robert Paul Acher,
Cpt James Sutherland Pitches,
1st Lt Ray Colon Williams,
M/Sgt Harry Herre Wecker,
T/Sgt Willie Warnie Alley,
T/Sgt Lester Melvin Cavallin,
T/Sgt Albert Carl McBride,
S/Sgt Fred Winston Smith.