De Havilland DHC-4 Caribou

Crashed in unknown circumstances while approaching Tapini Airstrip on a supply mission. The aircraft was destroyed and all four crew members were injured.

Shortly after takeoff from Camp Evans AFB, while climbing to an altitude of 335 meters, the Caribou collided with a USAF Boeing-Vertol CH-47A Chinook registered 66-19041 that was approaching the same airbase with 6 passengers and five crew members on board. The rear rotor of the Chinook struck the cockpit of the Caribou. Following the collision, the Chinook and the Caribou dove into the ground and crashed few hundred yards from the runway end. All 26 occupants were killed in the accident and up to date, this was considered as the worst aerial collision involving USAF in Vietnam. At the time of the accident, the Caribou speed was about 190 km/h while the Chinook was approaching Camp Evans at a speed of 185 km/h.
Caribou crew:
Cpt Wayne Philip Bundy,
1st Lt Ralph Schiavone,
S/Sgt Donald Gene Cleaver,
S/Sgt James Kenneth Connor.

While on an airlift flight near the Cambodian border, the aircraft was hit by enemy fire on its starboard wing. The airplane went out of control and crashed in flames, killing all three crew members.
Crew:
Cpt Robert George Bull,
1st Lt Ralph William Manners,
A1C David Frederick Sleeper.

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.

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.

Shortly after takeoff from Phù Cát Airfield, while in initial climb, the crew reported an engine failure when the airplane stalled and crashed few dozen yards from the runway end. All five occupants were rescued while the aircraft was destroyed.

While on a supply mission in the region of Bình Thủy, the airplane was struck by a mortar shell that hit the fuel tank. The crew was forced to attempt an emergency landing. The aircraft crash landed in a rice paddy field and came to rest. Both crew members were rescued while the aircraft was damaged beyond repair.

While approaching Qui Nhơn Airport on a flight from Pleiku, weather conditions deteriorated and the crew was informed by ATC that the airport was closed to traffic because the visibility was below minima, and was vectored to Nha Trang. The pilot-in-command abandoned the approach, started a go-around procedure and diverted to Nha Trang. Few minutes later, while cruising in a limited visibility due to low clouds, the airplane struck tree tops and crashed on the top of a wooded mountain. As the airplane crashed in an enemy zone, SAR could not reach the site. The wreckage was eventually found few weeks later. All 26 occupants have been killed. At the time of the accident, the visibility was poor and the mountain was shrouded in clouds.
Crew:
Maj Thomas Dewey Moore,
Maj William Jerome Clark,
S/Sgt Arturo Delgado-Marin,
S/Sgt Stanley Joseph Yurewicz.

While approaching An Thới Airfield, the airplane crashed in unknown circumstances into a river. The aircraft was destroyed and both pilots were rescued.

While approaching a US special Army Forces camp, the airplane was mistakenly shot down by a US 155 mm howitzer. The tail was torn off and out of control, the airplane dove into the ground and crashed. All three crew members were killed.
Crew:
Cpt Alan Eugene Hendrickson,
Cpt John Dudley Wiley,
T/Sgt Zane AUbry Carter.