become the united states air force a necessary move first proposed years previously by general billy mitchell. w.o. stewart symington becomes the first secretary of the department of the air force. general counsel sparks, veteran of the early aviation section of the army's signal corps, and distinguished for his record, both world wars. they becomes the first chief of staff of, the united states air force. a year or so after world war two, there were more than 300,000 of us in the air force. and now we had a uniform, our own. we used to be in the army. now we had a new look. and there were about 4000 of us left to. some of us used to be wacs in the army air forces, and a lot us joined up after the air force, a separate service. and. in october 1947, admiral test center in california history was made by this aircraft, the exact one and its pilot captain, charles yeager. this airplane and this pilot are about to be the first ever to fly faster than the speed of sound in level flight. of a b-29 will take the ax at 1:00 and launch her an altitude of about 35,000 feet. the x-1 is not a military ai