On Nov. 21, 1961, a fire at Wright Paterson Air Force Base, located between Springfield and Dayton, killed two firefighters.
Dale Kelcher and William Collins were last seen alive entering the headquarters of the Air Force logistics command, which took fire at about 11 p.m. that night. [Top two photos]
Four days later, another major fire gutted a building at the base. [Bottom photo]
Both blazes were deemed accidental.