Jisho

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Noun
1. force; unit; corps; echelon; element
Wikipedia definition
2. TroopA troop is a military unit, originally a small force of cavalry, subordinate to a squadron and headed by the troop leader. In many armies a troop is the equivalent unit to the infantry section or platoon. Exceptions are the Royal Horse Artillery and the US Cavalry, where troop refers to an infantry company or artillery battery. A cavalry soldier of private rank is called a trooper (abbreviated Tpr. , not to be confused with trouper).
Read “Troop” on English Wikipedia
Read “部隊” on Japanese Wikipedia
Read “Troop” on DBpedia

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