Crossword Genius

USAF coinage of '52 (4)

Ross

I believe the answer is:

ufos

'usaf coinage of '52' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ufos that I've seen before include "Mysterious phenomena" , "Mysterious objects in sky" , "Potential alien craft" , "Initially, formal flying saucers" , "Initially, official flying saucers" .)

I've seen this clue in the Newsday and the Newsday.com.
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