The SAC crews (Crew Dogs) were drawn from every SAC base, I think, all bases. They were rotated for a tour of duty, normally 100 missions, if memory serves. Select, Everready, and Regular crews participated.
A lot of AC's (Aircraft Commanders) liked to get their crews to U-Tapao from Andersen in Guam, naturally, because it was a much shorter flight to the target areas. And let's face it, there was just more to do in Thialand than on the rock. Coming out of Andersen, it was a long flight and one had to pick up a "Young Tiger" KC-135 from Kadena in a number of air refueling areas near the Philippines.
I never heard of any AC-130s or AC-119s as part of SAC. I think they came under the 7th AF (PACAF) and not the 8th out of Andersen. I know the AC-47s did because on pages 52-55 of the 7th AF In Country Tacical Air Operations Handbook, 20 Mar 68; it discusses employment and tactics.
The B-52Ds in SEA would normally strike from three to seven target areas in a 24-hr period and rack upto 1200 sorties (total force) per month. The sorties normally had two, three-ship, cells and while the BUFFs operated outside of the tactical air environment under COMUSMACV, the strikes were coordinated (so we were told) with tactical air. The tactics, techinques, and operating practices of B-52 forces were determined entirely by SAC.