Vietnam

Crashed in unknown circumstances near Quy Nhơn Airport. All four crew members survived while the aircraft was destroyed.

While cruising at low height, the airplane was struck by enemy fire. The pilot was able to complete an emergency landing in a rice paddy field and all three crew members evacuated safely while the aircraft was destroyed by a post crash fire.

The four engine aircraft was on its way from Cam Ranh Bay to Kadena AFB, Okinawa, carrying a crew of eight. While cruising along the Vietnam shore, about 72 km northeast of Nha Trang, the airplane suffered an in-flight explosion and crashed into the sea off Phú Hiệp. All eight crew members were killed.
Crew:
Lt Cdr Ralph Burton Cobbs,
Lt Donald Edwin Siegwarth,
Lt Clement Olin Stevenson,
Lt Edward Leon Romig,
AN M. J. Savoy,
YN2 Jack Ishum Dempsey,
ADJ2 Curtis David Collette,
ADR2 Stanley Jon Freng.

The crew departed Đà Nẵng Airport on a bombing mission over the Thanh Hoa bridge. Following an apparent uneventful mission, it is believed the aircraft crashed in unknown circumstances into the Sông Mã River. Nevertheless, no trace of the aircraft nor the eight crew member was ever found.
Crew:
Maj Thomas Franklin Case,
1st Lt Harold Jacob Zook,
Cpt Emmett Raymond McDonald,
Cpt Armon D. Shingledecker,
1st William Rothroc Edmondson,
S/Sgt Bobby Joe Alberton,
AM1C Philip Joseph Stickney,
AM1C Elroy Edwin Harworth.

The crew departed Nha Trang Airport for a night time mission to drop flares over friendly positions. While flying at an altitude of 6,500 feet, the airplane was shot down by enemy fire. The crew attempted to divert to the nearest suitable terrain when control was lost. The airplane crashed in flames, killing all five occupants.
Crew:
Cpt Stanley Gilbert Cox,
1st Lt Albert Richard Wilson,
M/Sgt Raymond Charles Jajtner,
A1C William John Moore,
A1C Jerry Mack Wall.

The crew was engaged in a supply mission near the Cai Cai Camp. While dropping a load of rice, a rice bag became stuck outside the airplane. Control was lost and the aircraft crashed in an open field. Two crew members were killed while two others were injured.

At liftoff at Kon Tum Airport, while in initial climb at a speed of 80 knots, the left engine oversped. The pilot-in-command retracted the landing gear and attempted an emergency landing in an open field located past the runway end. The aircraft belly landed, slid for several yards and struck two people before coming to rest. There were no injuries among the occupants while both people on the ground were killed.

On final approach to Pleiku Airport by night, the aircraft struck the ground few hundred yards short of runway and came to rest. Three crew members were killed while two others were injured. The aircraft was destroyed. The crew was completing one of his first rotation on this airport at the time of the accident. Visibility was poor due to the night and marginal weather conditions.
Lt Col Lee Bernard Tate,
1st Lt John Lawrence Banks,
A1C Ronald Charles Logan.

Due to a failure in the propeller pitch mechanism one of the engines' propellers could not be used to decelerate. The airplane swerved off the runway into a ditch, in an attempt to avoid a truck at the end of the runway. Damage was repairable, but the Hercules was damaged beyond repair when recovery crew attempted to tow the airplane using a tank and a steel cable through openings in the fuselage.
Source: Chris Hobson

The HU-16B Albatross flying boat was deployed to rescue two crew members of a downed McDonnell Douglas F-4C Phantom off Haiphong in the Gulf of Tonkin. The Albatross landed in the sea close to the shoreline. It was quickly approached by several North Vietnamese boats. They began to open fire on the Albatross, finally firing a mortar shell. They flying boat burst into flames. The survivors were later rescued by Navy helicopters.
Crew:
Cpt David P. Westenbarger,
Lt Walter Hall,
Cpt Donald Price,
S/Sgt Clyde Jackson,
A1C Robert Larie Hilton, †
A1C James Edward Pleiman. †
Source: Chris Hobson & Joe Baugher.