Some U.S. Army Reserve personnel who received final discharge as late as 1964
Navy and Marine Corps records
On the morning of the National Archives Fire, a very small number of U.S. Navy, United States Coast Guard, and U.S. Marine Corps records were out of their normal file area being worked on as active requests by employees of the National Archives and Records Administration who maintained their offices on the 6th floor of the building. When the NPRC fire began, these Navy and Marine Corps records were caught in the section of the building which experienced the most damage in the fire.
The exact number of Navy and Marine Corps records destroyed in the fire is unknown, since such records were being removed only for a few days while information was retrieved from the record and were not normally stored in the area of the building which experienced the fire. Estimates indicate that the number of affected records was no more than two to three dozen. Since such records are considered "special cases", the present policy of NPRC is to state that there were no Navy and Marine Corps records destroyed in the fire.
Cause
The exact cause of the 1973 National Archives Fire was never fully determined. An investigation in 1975 revealed that the affected floor, where the fire had started, had been under extreme temperature with little or no ventilation. It was speculated that air pressure on the floor had reached such a level that, combined with the very high temperatures in the enclosed space, the brittle and dry records began to spontaneously combust. The investigation also did not rule out embers of cigarettes as a possible cause, which were present in several trashcans.
Damage and reconstruction
The 1973 fire destroyed the entire 6th floor of the National Personnel Records Center. Damage from the fire can still be seen today. In 1974, a massive reconstruction effort was begun to restore the service records which were destroyed. In most cases where a military record has been presumed destroyed, NPRC is able to reconstruct basic service information, such as military date of entry, date of discharge, character of service, and final rank.