But logistical issues have delayed their battlefield debut -- even as soldiers in Iraq encounter tense urban situations in which the nonlethal capabilities of directed energy could be put to the test.

• “定向能”脉冲能被扼杀或衰退，依赖位置，很象是在“星际旅行”中的移象器，能被设置为杀死或仅仅是打晕。