blue helmet

noun

Definition of blue helmet 

: a soldier who is a United Nations peace-keeper and who wears the distinctive light blue helmet worn by such peace-keepers The blue helmets are in the West African country of Sierra Leone to help administer a peace agreement signed last July.— Tom Masland et al., Newsweek, 15 May 2000

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First Known Use of blue helmet

1956, in the meaning defined above

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The first known use of blue helmet was in 1956

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