The Immortal Jimmy Doolittle

Already a legend in aviation, on January 23, 1930, Lieutenant Doolittle was in New York as the Air Corps advisor on construction of Floyd Bennett Field. Happily enough, he signed the back of his calling card for an admirer. Only three weeks later, Doolittle resigned from the active duty Air Corps and went to work for Shell Oil. He retained a commission in the Reserves, and was, of course, back in uniform for World War II and further exploits.