Check this list, it is updated regularly and pretty accurate. For Randolph I noticed Gator (T-43), Hangover (12th FTW), Kiowa (C-12 332nd ALS), Tonto (T-1A), Luzon (T-37), Randy (T-38), Ranger (T-43), Spur 01 (AETC Commander AC), there may be others, that was a quick look.
That is the same list that I use. Most of the call signs on that list are up to date. The call sign Luzon is a T-6 call sign from the 559 FTS. The 332nd ALS) is not here anymore. The T-43 has been replaced with the T-6. I am waiting to here if they are reusing some of the older call signs.