Prefix | Valid Time | Note | Sample |
---|---|---|---|
QM | 1954-1962 | 4 digits or long format with last two digits year number. | |
DA | 1950s-1961 | The last two digits of contract number represented the year | |
DSA-# | 1962-1965 | The last two digits of contract number represented the year.
Letter might on each side of the year number. |
|
DSA-# | 1965 | No Dating Suffix | |
DSA-### | 1965-1966 | No Dating Suffix | |
DSA-### | 1966-1977 | General format contract number as today | |
DLA-### | 1977-1994 | General format contract number as today | |
SPO-### | 1994-2003 | General format contract number as today |