To provide morale and entertainment to military personnel during World War II, FDR created the USO [wiki] (United Service Organizations).
In the past, the USO had put together performances featuring famous entertainers of the day (like Bob Hope).
Today, however, the military had trouble sending big name entertainers to Iraq, so they turned to smaller bands. Here's a video from ABC News interviewing one such band called Edison.
Link - Thanks Natalie!