One went down behind enemy lines - the cause was unknown - and the Pentagon said the two-person crew had been taken prisoner.

一架飞机在伊作战线后方跌落--事故原因未知--五角大楼表示有两名飞行员被俘虏。

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With games like "Fallout, " "BioShock, " and "XCOM: Enemy Unknown, " Smith thinks gamers are evolving.

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"XCOM: Enemy Unknown" is a science fiction, strategy game pitting Earth against an invading alien force.

CNN: Two games in one in 'XCOM: Enemy Unknown'

Perhaps this is why there are no nuclear weapons in Xcom: Enemy Unknown.

FORBES: Why Don't We Nuke the Aliens in Xcom?