1964 :
During the Vietnam War our first American squadron assigned at Udorn RTAFB were primarily TDY personnel from the 5th Tactical Group, Don Muang RTAFB at the Bangkok Air Port , who were known at Udorn RTAFB as the 333th Air Base Squadron (ABS), in October 1964.

1965:
The 333rd Air Base Squadron at Udorn RTAFB was redesignated the 6232nd Combat Support Group (CSG) in July 1965, then assigned to the 13th Air Force , then the only Thailand based tactical wing in Thailand was at Korat Royal Thai Air Force Base (RTAFB), the 6234th Tactical Fighter Wing.

1966:
U.S.A.F. combat support personell were being secretly assigned PCS to Udorn RTAFB and other Thailand bases, where they were strictly NOT allowed to even tell family members where they were being assigned.
The Udorn RTAFB 6232nd Combat Support Group (CSG) at Udorn RTAFB was redesignated the 630th Combat Support Group (CSG) in April 1966, with a reporting responsibility to the Deputy Commander of the 7th Air Force/13th Air Force (7/13AF), who was then headquarters at Udorn RTAFB.

1966, September:
The 432nd Tactical Reconnaissance Wing (TRW) was organized at Udorn RTAFB.
The 630th CSG was placed under this new wing and redesignated the 432nd Combat Support Group CSG).

Above courtesy of http://www.geocities.com/edavis.geo/ud.html