5 takeaways from AP's reporting on a historic fire that destroyed millions of veterans' records

Fifty years ago, millions of veterans' official files were destroyed in a huge fire at the Military Personnel Records Center in suburban St. Louis.

The July 12, 1973, fire consumed an estimated 16 to 18 million personnel files, the vast majority covering the period just before World War I through 1963. It is believed to be the largest loss of records in U.S. history related to a single catastrophic event.

The loss of records has forced veterans and their families to fight for benefits, medals and recognition they’d earned.

Here are the key takeaways from the AP's reporting, including interviews with several custodians who were there the day of the blaze:

WHAT HAPPENED ON THE DAY OF THE FIRE?

Shortly after midnight, a motorcyclist passing by noticed smoke coming from an upper story and alerted guards. The fire quickly spread through the sixth floor, with water and smoke damaging records on the floors below. It took firefighters from more than 40 departments about four days to extinguish the blaze.

WHAT WAS THE IMPACT ON VETERANS?

The Official Military Personnel File (OMPF) documents housed at the center chronicle nearly every facet of a person's service, including dates, rank, stations, medals and injuries. Veterans can use this information to obtain medical care, insurance, loans, job training and other valuable government benefits.

WHAT WERE THE THEORIES INVESTIGATORS CONSIDERED IN TRYING TO FIND THE CAUSE?

There were about a dozen fires at the center in the previous two and a half years, several suspected as arson. FBI agents ran down numerous tips, including that an employee of Asian "extraction” or “left-wing” radicals had set the fire. Agents also questioned workers on their feelings toward the ongoing Vietnam War.

WHAT WAS THE FINAL DETERMINATION ON THE CAUSE?...