部队正从北部基地发动军事行动。
这些部队鲜少处于行动的中心：在阿富汗，他们留驻于相对平静的北方；在黎巴嫩，他们则在海上巡逻，而不是在陆地上。
These troops have rarely been at the center of the action: in Afghanistan, they stay in the relatively calm north; in Lebanon, they patrol at sea, not on land.
一旦军事行动的必要性不复存在，部队必须撤离。
As soon as the necessity for action is over the troops must be withdrawn.
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