Sentence:  I asked the same questions inside the launch-control rooms of an Atlas missile base in Wyoming , where officers who wear sidearms are <WSD>manning</WSD> the `` commit buttons '' that could start a war - accidentally or by design - and in the command centers where other pistol-packing men could give orders to push such buttons . 
Meaning of the word marked with <WSD> tags:  take charge of a certain job; occupy a certain work place