"A","Army codes"
"C","Coast Guard codes"
"D","DoD Occupational Conversion Code"
"F","Air Force Specialty Code (AFSC)"
"G","Office of Personnel Management (OPM) Series codes GS and WG"
"J","Army Additional Skill Identifier (ASI)"
"K","National Security Personnel System (NSPS) code"
"M","Marine Corps Military Occupational Specialty (MOS)"
"N","Navy Rating, Navy Enlisted Code (NEC), and Navy Officer Billet (NOBC)"
"P","Navy Designator Code"
"Q","Army Special Qualification Identifier (SQI)"
"S","Navy Subspecialty (SSP) Code"
"V","Navy Additional Qualification Designation Code (AQD)"
"X","Air Force Prefix code"
"Y","Air Force Special Experience Identifier (SEI)"
"Z","Air Force Activity Code"