U.S. Air Force Tech. Sgt. Richard Westra, special equipment operator assigned to the 21st Surveillance Squadron, Det. 1, briefs Air Forces Southern Foreign Liaison Officers during a tour of a WC-135 Constant Phoenix aircraft, Feb. 13, 2025 at Davis-Monthan AFB, Arizona. The WC-135, which traveled from Offutt AFB, Nebraska, plays a critical role in nuclear treaty monitoring by collecting airborne effluents and particulates. (U.S. Air Force Photo by Andrea Jenkins)