U.S. Air Force Capt. Caleb Egli, a pilot assigned to the 54th Air Refueling Squadron, explains the interworkings of the KC-135 Stratotanker to students of the STARBASE program, Oct. 24, 2019, at Altus Air Force Base, Okla. The KC-135 provides global mobility support with aerial refueling and minor cargo transportation. (U.S. Air Force photo by Senior Airman Cody Dowell)