Last stand
It was on April 29th, one day before South Vietnam ceased to exists as a country. A lone AC-119K piloted by Lt. Thanh "Cambodge" (because he had very dark skin like Cambodians) and Lt. Tran Van Hien (aircraft commander) of the 821st Attack Squadron had been in the air all night trying to defend the Tan Son Nhut air base perimeter. Early in the morning the AC-119K had to land in order to refuel and re-arm. The 821 AS Squadron Operations Officer, Lt. Col. Chung, had asked the AC119K crew not to take off again but the crew insisted. It took off again right away and some time later was joined by two A-1H Skyraiders belonging to the 518th Fighter Squadron, one of them piloted by Maj. Truong Phung, the other by Capt. Phuc "oi" (oi means throw up because he threw up a lot when he first learned to fly), acting as Maj. Truong Phung's wingman.

These three aircraft continuously strafed the advancing NVA and VC troops the best they could. At about seven AM, the fate of the AC-119K was sealed by an SA-7 Strella shoulder-fired missile. While the gunship was flying at about 3000 feet the missile scored a direct hit and severed one of the tailbooms, causing the aircaft to burst into flames and crash. One of the gunners, Sgt. Son, managed to bail out but the canopy of his parachute got caught in the tail of the AC-119K and he and the other crew members were dragged to death.
Some time later, at 6.40 AM, Maj. Truong Phung's Skyraider unfortunately was hit by another SA-7 Strella missile and it plummeted to the ground, killing him. Capt. Phuc "oi"'s A-1H continued to strafe the enemy until all it's ammunition was expended. Phuc landed back at TSN at 6:50 AM. He is currently living in central California.
From a tactical point of view these missions were pointless. The crew knew they would not able to stop the enemy forever, and that their country was lost. Still they chose to take a stand and defend their beloved South Vietnam to the bitter end. They could have left the situation and head for Thailand, like so many did in those final days. They did not. They did more than their duty and paid the highest price.
Last stand update
I received the following update on this event from Van Thai:
