
The older codes are still valid for persons wishing to credit their military aviation maintenance experience toward meeting the requirements of the FAA airframe and powerplant mechanic certificate. Marine Aerial Refueler Transport Squadron 234 Marine Medium Tiltrotor Squadron 764 Marine Wing Support Squadron 471 Marine Wing Support Squadron 473 Marine Unmanned Aerial Vehicle Squadron 4 Marine Light Helicopter Attack Squadron 775 Marine Transport Squadron 1 Marine Aircraft Group 49. Marine Corps MOS 57, CHEMICAL, BIOLOGICAL, RADIOLOGICAL AND NUCLEAR (CBRN) DEFENSE 58, MILITARY POLICE, INVESTIGATIONS, AND CORRECTIONS 59, AVIATION COMMAND. Use the new codes for active duty time after January 1990. The Marine Corps MOS structure is not as detailed as the Air Force AFSC.



Following are the updated, new, and the older MOS codes for the U.S. The Marines have over 180 enlisted MOSs that are made up of four digits.
