From The Collaborative International Dictionary of English v.0.48 [gcide]:
2. a usually small military unit trained to perform special missions, often behind enemy lines, and usually employing hit-and-run tactics. Such units often have the destruction of fixed targets, such as enemy installations, as their mission, in contrast to normal combat units which engage the enemy army directly. [PJC]
From WordNet (r) 3.0 (2006) [wn]:
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