In 1967, RMK-BRJ constructed the second 10,000-foot concrete runway. In late 1951, the French Air Force established the RVNAF 312th Special Mission Squadron at Tan Son Nhat Airfield equipped with Morane 500 Criquet liaison aircraft. In 1952 a heliport was constructed at the base for use by French Air Force medical evacuation helicopters. In 1953, Tan Son Nhut started being used as a military air base for the fledgling RVNAF, and in 1956 the headquarters were moved from the center of Saigon to Tan Son Nhut. But even before that time, French and Vietnamese military aircraft were in evidence at Tan Son Nhut. On 1 July 1955, the RVNAF 1st Transport Squadron equipped with C-47 Skytrains was established at the base. The RVNAF also had a special missions squadron at the base equipped with 3 C-47s, 3 C-45s and 1 L-26. The 1st Transport Squadron would be renamed the 413rd Air Transport Squadron in January 1963. In June 1956 the 2nd Transport Squadron equipped with C-47s was established at the base and the RVNAF established its headquarters there. It would be renamed the 415th Air Transport Squadron in January 1963. In November 1956, by agreement with the South Vietnamese government, the USAF assumed some training and administrative roles of the RVNAF. A full handover of training responsibility took place on 1 June 1957 when the French training contracts expired. On 1 June 1957 the RVNAF 1st Helicopter Squadron was established at the base without equipment. It operated with the French Air Force unit serving the International Control Commission and in April 1958 with the departure of the French it inherited its 10 H-19 helicopters. In October 1959 the 2nd Liaison Squadron equipped with L-19 Bird Dogs moved to the base from Nha Trang. In mid-December 1961 the USAF began delivery of 30 T-28 Trojans to the RVNAF at Tan Son Nhut. In December 1962 the 293rd Helicopter Squadron was activated at the base, it was inactivated in August 1964. In late 1962 the RVNAF formed the 716th Composite Reconnaissance Squadron initially equipped with 2 C-45 photo-reconnaissance aircraft. In January 1963 the USAF opened an H-19 pilot training facility at the base and by June the first RVNAF helicopter pilots had graduated. In January 1963 the 211th Helicopter Squadron equipped with UH-34s replaced the 1st Helicopter Squadron.