Upon the creation of Air Force service numbers, the Air Force had no prefix codes for special situations but did create a series of suffix one letter codes to be used solely be officers. The original suffix letter codes were:
A: Used from 1948 to 1965 by male Regular Air Force officers
E: Used until 1965 by male Regular Air Force warrant officers
H: Used until 1965 by female Regular Air Force warrant officers
K: Used by cadets at the Air Force Academy
W: Used from 1948 to 1965 by female Regular Air Force officers In the mid-1950s, the Air Force created several prefix codes intended to replace the suffix letters, although both prefixes and suffixes were still being used simultaneously in military service records. The 1950s prefix codes were as follows:
AA: Used by female personnel of the
WAF AD: Used by Aviation Cadets
AF: Used by male enlisted personnel
AO: Used by Air Force reserve officers
AR: Use by Air Force dieticians
AW: Used by Air Force warrant officers In 1965, the Air Force standardized the prefix codes and created this final version.
FG: Used by officers, warrant officers and enlisted personnel of the Air National Guard
FR: Used by officers, warrant officers and enlisted personnel of the Regular Air Force
FT: Used by officers and warrant officers who had yet to be assigned an Air Force component
FV: Used by officers, warrant officers and enlisted personnel of the Air Force Reserve Older prefix and suffix codes continued to survive until the formal disestablishment of Air Force service numbers in 1969. In addition, the prefix "FR" was frequently switched between a prefix and suffix. After the establishment of social security numbers as the primary means of personnel identification, many Regular Air Force personnel would annotate the prefix "FR" before their Social Security number; a practice which continues to this day. == Geographical Codes and Service Number distribution==