Master Sgt. Ryan Dolan and Tech. Sgt. Benjamin J. Park, The U.S. Air Force Band Singing Sergeants, perform at the 2013 Fourth of July firework show at the Air Force Memorial in Washington, D.C. Col. William Knight, 11th Wing/Joint Base Andrews Commander gave the opening remarks. (U.S. Air Force photo/Airman 1st Class Nesha Humes)