by ThickAsThieves
Inactive safes were set to 50-50-50 as some safe locks will jam up if the last number is close to zero. The forbidden zone was 90-20.
GSA is the General Services Administration which handles purchasing and sales for the non military side of the government including post offices etc. Military surplus was Defense Surplus Sales Office DSSO (later Defense Reutilization and Marketing Office DRMO) and each base had a Property Disposal Office PDO.