1927-1997 20thcentury aeronautics air-force americanhistory autobiography aviation biography boyd collegesuccess english fighter-pilot fighterpilots fighterplanecombat history influential innovation inspirational john john-boyd leadership military military-genius military-history military-philosophy military-tactics militaryhistory ooda-loop socialsciences strategic-thinking strategy tactical unconventional-war unitedstates vietnam-war war-strategy worldwarii