Udon was a front-line facility of the United States Air Force (USAF) during the Vietnam
War from 1964 through 1975. The USAF forces at Udon were under the command of the
United States Pacific Air Forces (PACAF).
The first USAF unit assigned at Udon Royal Thai Air Force was the 333d Air Base Squadron
in October 1964. Before the formation of the squadron, support personnel were provided
by temporary duty personnel from the 35th Tactical Group at Don Muang Royal Thai
Air Force Base.
On 18 July 1965, the 333 rd Air Base Squadron was re designated the 623 2nd Combat
Support Group (CSG). This unit reported directly to the Commander, 13th Air Force
and to the 623 4th Tactical Fighter Wing (TFW) at Korat Royal Thai Air Force Base,
at that time the only tactical wing in Thailand.
The formation of the group at Udon RTAFB was brought about because of expanding Air
Force programs., an increase in assigned personnel and increased base support requirements.
Most personnel at Udon RTAFB, prior, to the formation of the group, were temporary
duty assignments. Shortly before the group was activated a gradual input of permanent
party personnel was made to replace those on temporary duty.
F-104 Starfighter’s on the 15th November 1965 the 623 2nd CSG was given the responsibility
of reporting directly to the Deputy Commander 2nd Air Division/13th Air Force rather
than directly to the Commander, 13th Air Force. The 623 2nd CSG was re designated
the 630th Combat Support Group on 8th April 1966, with a reporting responsibility
to the Deputy Commander, 7th Air Force/13th Air Force (7/13AF), headquartered at
On the 6th June 1966 the 476th Tactical Fighter Squadron of the 479th Tactical Fighter
Wing at George AFB, California deployed eight F-104C’s to carry out escort and bombing
missions with the gun-less F-4Cs. An additional 12 F-104C’s joined the 8th TFW on
The 8th TFW F-104’s were initially involved in escort missions in support of F-105D
strike aircraft hitting targets in North Vietnam. They were involved in escorts of
EF-105F Wild Weasel. One problem was that the F-104C’s were not initally equipped
with electronic countermeasures gear, and had to rely on F-105’s for warnings of
lock-ons from enemy radar facilities. However, once again the mere presence of these
F-104C’s managed to keep enemy MiG's away from the strike aircraft.
The F-104C’s carried out escorting and bombing missions on North Vietnam, with over
5,290 sorties. The Air Force decided to replace these F-104C’s by more efficient
McDonnell F-4D Phantoms starting in July of 1967. The last Starfighter left Thailand
later that month.