Assertion: mk grenade | /r/CapableOf | replace failed mk 1 grenade
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text: The Mk 2 grenade replaced the failed Mk 1 grenade used by the U.S. military during World War I. 44 million were ordered and more than 21 million were completed (it was possible to convert Mk 1 grenade bodies to the Mk 2 configuration) before the war ended, but few reached American troops overseas.