Soldiers are people, too - young people and they just want to have fun. Why can't we just live in peace? Israeli male soldiers break out in dance, see Youtube video and video.
And recently, in Iran, these youth are sentenced to 3 to 7 years prison time and 91 lashes in Iran "singing and dancing": "Iranians arrested for making dance video and being happy", see video on Youtube.
US soldiers dancing in Afghanistan: Youtube link.