I've seen these in MACR's and Morning reports, codes listed against enlisted men. one if a little obvious, the ROG, which aligns with Ro, so I am guessing ROG is Radio Operator Gunner
here is an example
https://ww2irishaviation.com/USAAF_codes.png
Pilot = P
CP = Co Pilot
N = nav
B =- Bomb
AEG = ?? is it Aerial Engineer Gunner - whcih would fit with the Top Turret position?
ROG = radio operator Gunner I guess = RO
AAEG = ??? Gunner = Ball Turret
AROG = ?? = TG Tail Gunner
AAG = ?? Gunner = WG Waist Gunner