to commence Operation Frequent Wind, the helicopter evacuation of US personnel and at-risk Vietnamese. In the final evacuation, over a hundred RVNAF aircraft arrived in Thailand, including twenty-six F-5s, eight A-37s, eleven A-1s, six C-130s, thirteen C-47s, five C-7s, and three AC-119s. Additionally close to 100 RVNAF helicopters landed on U.S. ships off the coast, although at least half were jettisoned. One O-1 managed to land on the , carrying a South Vietnamese major, his wife, and five children. The ARVN 3rd Task Force, 81st Ranger Group commanded by Maj. Pham Chau Tai defended Tan Son Nhut and they were joined by the remnants of the Loi Ho unit. At 07:15 on 30 April the PAVN 24th Regiment approached the Bay Hien intersection () 1.5 km from the base's main gate. The lead T-54 was hit by M67 recoilless rifle and then the next T-54 was hit by a shell from an M48 tank. The PAVN infantry moved forward and engaged the ARVN in house to house fighting forcing them to withdraw to the base by 08:45. The PAVN then sent 3 tanks and an infantry battalion to assault the main gate and they were met by intensive anti-tank and machine gun fire knocking out the 3 tanks and killing at least 20 PAVN soldiers. The PAVN tried to bring forward an 85mm antiaircraft gun but the ARVN knocked it out before it could start firing. The PAVN 10th Division ordered 8 more tanks and another infantry battalion to join the attack, but as they approached the Bay Hien intersection they were hit by an airstrike from RVNAF jets operating from Binh Thuy Air Base which destroyed 2 T-54s. The 6 surviving tanks arrived at the main gate at 10:00 and began their attack, with 2 being knocked out by antitank fire in front of the gate and another destroyed as it attempted a flanking manoeuvre. At approximately 10:30 Maj. Pham heard of the surrender broadcast of President Dương Văn Minh and went to the ARVN Joint General Staff Compound to seek instructions, he called General Minh who told him to prepare to surrender, Pham reportedly told Minh "If Viet Cong tanks are entering Independence Palace we will come down there to rescue you sir." Minh refused Pham's suggestion and Pham then told his men to withdraw from the base gates and at 11:30 the PAVN entered the base. Following