Out of curiosity, what are the LAC and AC1 ranks?
Other ranks structure (from the lowest of the low)
AC2 = Aircraftsman, Second Class (raw recruit)
AC1 = Aircraftsman, First Class (the lowest useful rank after initial training)
LAC = Leading Aircraftsman
SAC = Senior Aircraftsman
JT = Junior Technician
Corporal
Sergeant
Senior Technician
Chief Technician (Deputy God, Flight Sergeant for non-Technical trades equivalent)
Warrant officer (God)