During a tour Oct. 20, Staff Sgt. Chris Joyce, 54th Air Refueling Squadron boom operator, explains to Soldiers from the 4th Battalion 3rd Air Defense Artillery, Fort Sill, Okla., about how the boom on a KC-135 Stratotanker is used to refuel other aircraft. The 4-3 ADA BN brought nearly 250 Soldiers to Altus completing a 10-day training event that tested communications between multiple Patriot missile battery sites and evaluated how the unit would handle scenarios that could be encountered in a deployed environment. (U.S. Air Force photo by Airman 1st Class Kenneth Norman/released/97th Air Mobility Wing Public Affairs)