1956 W.A. Heflin US Air Force Dict. 357: One-eighty, [...] 2. A reversal of stand, policy, or the like, as in ‘he did a one-eighty and agreed with the Commander’.at one-eighty, n.
1956 W.A. Heflin US Air Force Dict. 479: Space cadet. A hot pilot; a pilot that shows off.at space cadet (n.) under space, n.