Petty Officer 2nd Class Tim Mikula, an aviation maintenance technician from Coast Guard Sector Columbia River, demonstrates the use of an emergency smoke signal, the Mk-124, at Cullaby Lake County Park in Warrenton, Ore. Oct. 3, 2019. The Mk-124 signal device has two sides, one side produces a smoke signal effective in daylight and the other side produces light which is most effective at night. (U.S. Coast Guard photo by Petty Officer 3rd Class Trevor Lilburn)