Alliance since 1949

I believe the answer is:

'alliance since 1949' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for nato that I've seen before include "US/Europe alliance" , "International organisation for collective security" , "Military bloc" , "Western mil. alliance" , "Security agreement" .)

I've seen this clue in the USA Today.

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