tour of duty

noun
tour ( def 5 ).

Origin:
1865–70

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
They have served tour after tour of duty in distant, different and difficult
  places.
Their fathers are mostly alive, but have finished their tour of duty and gone
  home, often to waiting wives.
And it could be echoed by families across our country who have seen loved ones
  deployed to tour after tour of duty.
It was that second tour of duty that was somewhat enlightening.
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