A boy watches the United States Air Band perform during a flash mob at the Smithsonian National Air and Space Museum Udvar-Hazy Center in Chantilly, Va., Dec. 2, 2014. The band put on the event to promote their upcoming holiday concerts in the National Capital Region. (U.S. Air Force photo/ Senior Airman Nesha Humes)

Senior Master Sgt. Phillip E. Krzywicki, United States Air Force Concert Band French hornist, plays during a flash mob at the Smithsonian National Air and Space Museum Udvar-Hazy Center in Chantilly, Va., Dec. 2, 2014. The approximately six-minute flash-mob performance concluded with the playing of “Carol of the Bells” by Mykola Leontovych. (U.S. Air Force photo/ Senior Airman Nesha Humes)

Capt. Gilberto Perez, White House Communications Agency network systems chief, and his daughter, watch a flash mob at the Smithsonian National Air and Space Museum Udvar-Hazy Center in Chantilly, Va., Dec. 2, 2014. The United States Air Force Band played to spread the word about their free upcoming holiday concerts in the National Capital Region. Their mission is to honor those who have served, inspire American citizens to heightened patriotism and service, and positively impact the global community on behalf of the U.S. Air Force and America. (U.S. Air Force photo/ Senior Airman Nesha Humes)

Tech Sgt. Emily Snyder, United States Air Force Concert Band English hornist, begins playing the traditional English Folk song, “Greensleeves”, at the Smithsonian National Air and Space Museum Udvar-Hazy Center in Chantilly, Va., Dec. 2, 2014. The band conducted a flash mob to promote their free, upcoming holiday concerts in the National Capital Region. (U.S. Air Force photo/ Staff Sgt. Devon Suits)

Audience members watch the United States Air Force Band Singing Sergeants during a flash mob at the Smithsonian National Air and Space Museum Udvar-Hazy Center in Chantilly, Va., Dec. 2, 2014. The Udvar-Hazy Center is home to thousands of aviation and space artifacts and is the companion facility to the Museum on the National Mall in Washington, DC. (U.S. Air Force photo/ Senior Airman Nesha Humes)

Col. Larry H. Lang, United States Air Force Band commander, thanks audience members after their flash mob at the Smithsonian National Air and Space Museum Udvar-Hazy Center in Chantilly, Va., Dec. 2, 2014. Approximately 160 band members played for museum spectators promoting their free, upcoming holiday concerts in the National Capital Region. (U.S. Air Force photo/Senior Airman Nesha Humes)

Master Sgt. Joshua Kowalsky, United States Air Force Concert Band cellist, talks with his daughter after their flash mob at the Smithsonian National Air and Space Museum Udvar-Hazy Center in Chantilly, Va., Dec. 2, 2014. The band’s mission is to honor those who have served, inspire American citizens to heightened patriotism and service, and positively impact the global community on behalf of the U.S. Air Force and America. (U.S. Air Force photo/ Staff Sgt. Devon Suits)