1st Lt. Sam Strickland, 69th Expeditionary Bomb Squadron electronic warfare officer, operates an Oxygen Mask Test Unit while testing his mask, pre-flight, on Andersen Air Force Base, Guam, Oct. 22, 2019. Strickland, along with other 69th EBS aircrew members, support the Continuous Bomber Presence, a mission that routinely forward deploys aircraft in support of global strike capability and regional security to our allies. (U.S. Air Force photo by Airman 1st Class Michael S. Murphy)