U.S. Coast Guard Petty Officer 1nd Class Sean Gradin, a law enforcement program manager at Station Mayport, Florida, instructs Seaman Andrew Crawford how to change a hot barrel on an m240b machine gun exercise 9 miles offshore, Ponte Vedra Beach, Oct 26, 2022. All tactical boat crew members must qualify on the m240b prior to being fully qualified. (U.S. Coast Guard photo by Petty Officer 3rd Class Vincent Moreno)