Crossword Genius

Focus of the U.S.A.F.'s Project Blue Book (1952-1969) (4)

Ross

I believe the answer is:

ufos

(Other definitions for ufos that I've seen before include "Initially, formal flying saucers" , "Supposed spaceships" , "Unauthorised traffic from outer space?" , "Strange aerial objects" , "Supposed alien craft" .)

I've seen this clue in The New York Times.
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