Service number (United States Air Force)

These numbers were intended for all officers considered "Other Than Regular Air Force" (OTRAF) and were issued in chronological order by date of commission after 1948.

In 1969, when the Air Force discontinued service numbers, the officer cap of 3 999 999 had not yet been reached.

After 1969, the Air Force converted to Social Security numbers for service member identification.

This numbers extended from 10 000 000 to 10 999 999 and, like the Army, were used for Regular Air Force personnel who had enlisted from recruiting stations outside the United States.

The geographical codes for the Air Force were the same as the Army and recruiting stations had instructions to avoid repeat service numbers and to ensure that no service number was issued by both the Army and the Air Force.

Therefore, there were numerous cases of Air Force enlisted members holding 30 and 40 million service numbers.

The last range of Air Force service numbers was the 60 million series extending from 60 000 000 to 69 999 999.

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.

In all, a comparison of the state codes is as follows: Within the Regular Air Force, the range of 11 000 000 to 19 999 999 was reserved for Regular Air Force personnel who had enlisted from within the United States; With the first two numbers a geographical code and the last six a personal identifier.

Instructions were also in place that Air Force service members should not be assigned numbers already held by Regular Army soldiers.