MT driver (Bowser operator). Signals (Comms!!). Stores (not for storing).
Exceptional groundcrewman either;
A. Join 10 Regt AAC (civvy street).
B. Become pilots.
The remainder become potato carriers and spend their remaining 22 years hating aircrew telling everyone they didnt want to be aircrew anyway.
LE (Late Entry) AAC officers usually come from the RLC, AGC or any other Corps that has no idea whatsoever about Army Aviation.