Assertion: air chief marshal | /r/HasProperty | a four-star air officer rank
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Source sentences:
text: Air chief marshal (Air Chf Mshl or ACM) is a four-star air officer rank which originated and it is used by the Royal Air Force, where it is the most senior peacetime air force rank.
text: Air chief marshal is a four-star air officer rank and has a NATO ranking code of OF-9.