The Fire
A fire at the NPRC in St. Louis on July 12, 1973, destroyed about 80 percent of the records for Army personnel discharged between November 1, 1912, and January 1, 1960. About 75 percent of the records for Air Force personnel with surnames from "Hubbard" through "Z" discharged between September 25, 1947, and January 1, 1964, were also destroyed.
What Was Lost
It is hard to determine exactly what was lost in the fire, because there were no indices to the blocks of records involved. The records were merely filed in alphabetical order for the following groups:
World War I:
Army - Nov. 1, 1912 Sept. 7, 1939
World War II:
Army - Dec. 8, 1939 Dec. 31, 1946
Post World War II:
Army - Dec. 1, 1947 - Dec. 31, 1959
Air Force - Dec. 25, 1947 - Dec. 31, 1963
Millions of records, especially medical records, had been withdrawn from all three groups and loaned to the Department of Veterans Affairs (VA) before the fire. The fact that one's records are not in NPRC files at a particular time does not mean the records were destroyed in the fire.
The above is publicly available information copied directly from
www.VA.gov. The answers were there; all you had to do was look for them.