On October 14, 1947, Air Force pilot Chuck Yeager became the first human to break the sound barrier, flying the X-1. Yeager was an Army Air Corps pilot in WWII. After shooting down a German fighter plane, Yeager was shot down over France in March 1944. Helped by the French Resistance he escaped over the Pyrenees Mountains into Spain and was back in England by May.
At the time, pilots who had been shot down, worked with the Resistance, and made it back to England were forbidden to fly further combat missions. Yeager was able to obtain an audience with General Eisenhower to plead his case and was allowed to return to combat. In October 1944 he shot down five German fighters in one day.
In 2012, on the 65th anniversary of his 1947 flight, 89 year old General Chuck Yeager flew in a two-seater F-15 fighter, breaking the sound barrier once again. Best comment on the video: "he barely can get into the cockpit, his steel balls block the way".
In 2017 the 94 year old Yeager remains active on Twitter.
You can watch a theatric version of his 1947 flight in this clip from The Right Stuff.