President Barack Obama and his wife, first lady Michelle Obama, dance with Staff Sgt. Bria Nelson, 579th Medical Operations Squadron, Joint Base Anacostia-Bolling, Washington, D.C., and Gunnery Sgt. Timothy Easterling, Marine Barracks, Washington, D.C., during the 2013 Commander in Chief inaugural ball at the Walter E. Washington Convention Center in Washington, D.C., Jan. 21, 2013. Throughout the 57th Presidential Inauguration, the Obama and Biden families have taken the opportunity to highlight the spirit of service and selflessness seen everyday U.S. military men, women and their families. (U.S. Air Force photo by Chief Master Sgt. Robert W. Valenca/Released)