Armor in the A.F. was fun to drive wether tracked or wheeled. The hard part was taking the course. That had to be done on your off hours before or after your shift and you had to make each lesson without fail. After a couple weeks with basically no days off and not much sleep, the only ones not pushing exhaustion were the instructors. When finished were one of a few to be able to operate the M-112 qnd M-706E2 with a 13 man reaction team. With me being in Law Enforceent I only got assigned one during alerts or unusual circumstances.
I saw some unusual amor at Camp Bullis, Texas during one of my combat schools in the 70s, I think their number started with a 9, but I'm not sure.