Visitors to the Fort D.A. Russell Days open house at

Visitors to the Fort D.A. Russell Days open house at F.E. Warren Air Force Base, Wyo., participate in a period dance Saturday evening, July 21, 2012. The dance was one of the festivities of the annual base open house celebrating the history and heritage of the longest continually operating base in the U.S. Air Force. F.E. Warren was originally established by the U.S. Army as Fort D.A. Russell in 1867. (U.S. Air Force photo by R.J. Oriez)