Alliance formed in 1949 (4)

I believe the answer is:

nato

'alliance formed in 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 "Military bloc" , "Military alliance (acronym)" , "Western mil. alliance" , "Collective security alliance engaged in Bosnia" , "International organisation for collective security" .)

I've seen this clue in the Universal, the Wall Street Journal and the USA Today.

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