Its main role in public security is as a deterrent; even on the quietest days, its troops patrol in armoured personnel carriers, pointing automatic weapons out of the Windows.

即使在最安静的日子，他们在公共安全领域的主要角色也只是一个威慑者，他们的巡逻队座在装甲车里，用自动武器指着窗外。

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Another 350 troops would be kept as a "flexible reserve, " which could be used to strengthen public security in events such as the parliamentary election.

其余350人作为预备力量，在阿富汗议会选举等重大事件期间参与安保工作。

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On the other hand, some information must be protected from public disclosure for the sake of our security -- for instance, the movement of our troops, our intelligence-gathering, or the information we have about a terrorist organization and its affiliates.

WHITEHOUSE: President Obama: Our Security, Our Values