A Civil War reenactor representing a Union Army Air Corps officer explains how Thaddeus Lowe used inflation wagons to inflate his hot-air balloons at the "Mr. Lincoln's Air Force" Family Day on June 11, 2011. The event commemorated the 150th anniversary of Lowe's tethered ascent in a gas balloon, which attracted the support of President Lincoln and led to the creation of a balloon corps for the Union Army.