Let's no forget about Bob Feller.
"The farmboy from Van Meter, Iowa was only 17 when he struck out eight members of the St. Louis Cardinals in three innings of an exhibition game. After this awesome display of pitching, Feller was advised to seek voluntary retirement from high school in order to sign a pro-baseball contract. For twenty years, the teenage phenomena was known as "Bullet Bob" and "Rapid Robert." As a rookie, he struckout 15 batters in a single game, which at that time, was an American League record. In 1940, Bullet Bob became the first American League pitcher to throw a complete game no-hitter on opening-day. At age 23, his career was interrupted by his four-year enlistment in the Navy. Upon entering the Navy, Feller became an anti-aircraft gunner aboard the U.S.S. Alabama and came out a highly decorated war veteran. He then re-entered the majors to regain his dominance on the mound. Even though his military career consumed four prime baseball years, Feller ranks 28th in history with 266 wins. He remains the Indians all-time leader in shutouts (46), strikeouts (2,581), innings (3,828), and All-Star appearances (8). To this day, baseball historians speculate that Bullet Bob might have won 350 games and recorded nearly 3,500 strikeouts had he not joined the military. In 1962, this bullet hit the bulls-eye with an induction into the Hall of Fame.
Ted Williams was, I believe, a fighter pilot in the Marine Corp. and actually flew combat missions. I know he was involved in a crash during his military career.