Air Force Photos

A 22-aircraft "freedom launch" took place Sept. 11, 2013, at Travis Air Force Base, Calif. Seven C-17 Globemaster IIIs, 11 KC-10 Extenders and four C-5B Galaxies from the 60th Air Mobility Wing lined up in what is historically referred to as an "elephant walk,” then launched consecutively over 36 minutes to take part in Air Mobility Command missions. The first plane in the lineup, a C-17, launched at 8:46 a.m., the same time terrorists crashed American Airlines Flight 11 into the north tower of the World Trade Center in New York City 12 years earlier. (U.S. Air Force photo/Ken Wright)