Petty Officer 2nd Class Lyman Dickinson and Petty Officer 3rd Class William Arrison, rescue swimmers at Coast Guard Sector San Diego, discuss procedure during a mass-casualty rescue exercise aboard Coast Guard Cutter Haddock at Sector San Diego Feb. 6, 2019. Mass-casualty rescue exercises allow responders to improve proficiency for difficult tasks in a safe environment. (U.S. Coast Guard photo by Fireman Taylor Bacon/released)