Staff Sgt. Samuel Ley, a 66th Training Squadron, Detachment 1 survival, evasion, resistance and escape, or SERE, specialist, demonstrates how to use an MK-124 smoke and illumination signal on the Chukchi Sea, Jan. 13, 2021. The MK-124 is a smoke and illumination flare used to signal search and rescue personnel in the event of an emergency or extraction situation. (U.S. Air Force photo by Maj. Tyler Williams)