Navy Petty Officer 3rd Class Spencer Clark practices using a portable exothermic cutting unit at the Bremerton International Emergency Services Training Center, Bremerton, Wash., March 22, 2018. The cutting unit is used in personnel rescue and to provide access to damaged or burning compartments in damage control emergencies. Clark is an aviation boatswain's mate handling assigned to the aircraft carrier USS Nimitz. Navy photo by Petty Officer 2nd Class Wyatt L. Anthony