The North Vietnamese “General Offensive, General Uprising” during the Tet holiday of 1968 did not produce the “general uprising” among the South Vietnamese people. The “Offensive” however did strike every significant American and South Vietnamese military and political center in South Vietnam, including the American air base outside the city of Bien Hoa.
Bien Hoa Airbase was 60 miles north of Saigon and the primary tactical air base for War Zones C and D along the Cambodian border. At 0330, 31 January 1968, the 68th, 274th, and 275th NLF (National Liberation Front, i.e. Viet Cong) main force regiments assaulted Bien Hoa Airbase. The Viet Cong broke through and overran a portion of the perimeter secured by the US Air Force’s 3rd Security Police Squadron and seized the eastern portion of the airbase. Before they crossed the last remaining obstacle, the runway, the Communists stopped to regroup to coordinate a massive final assault.
The flat runway bisected Bien Hoa Airbase from north to south and presented an obvious killing ground for American defenders on the west side. But unbeknownst to the Communists, they overran the air base’s arms rooms, which were located on the east end of the base. The 10,000 airmen and civilians trapped on the west side of the base were unarmed. Just a single platoon, 30 airmen, were left to secure the 3050m long runway. All the Communists had to do was cross the runway and they could have massacred everyone.
Just after the sun rose, at about 0640, the Communists began their assault. “You could see the VC rise for the attack”. At least 2500 Communists charged across the open space, and the airmen and civilians watched helplessly from the west side of the runway. They had no weapons. Their arms were all securely locked away and seized the night before when the NLF overran the eastern perimeter.
Every one of the Americans assumed they were going to die.
As the powerless airmen looked on the mass of humanity screaming across the runway, their saviors appeared in the form of three Cobra gunships from the 145th Aviation Battalion. The Cobras strafed and rocketed the airstrip breaking up the Communist attack. The Cobras’ attacks would continue for the rest of the day. One section would attack, as one would disengage and return to rearm and refuel at a small helipad on the south side of the airbase. One more would return to replace the attacker. The Cobra gunships continued the rotation for the next 51 hours.
On the morning of 1 February, 1968, crew chiefs of Bien Hoa’s F-105 Thunderchief fight-bombers on the far west side of the base readied their planes as Cobras were still killing anything they saw. Dodging bodies and craters on the south side on the runway, the Thuderchiefs took off and then immediately turned and plastered the NLF, in the only instance in US Air Force history where they had to bomb their own base.
The next day, a squadron of the 11th Armoured Cavalry Regiment and two battalions of ARVN (Army of the Republic of [South] Vietnam) arrived to secure the airbase.