CELTIC SEA (April 14, 2021) Airman Clinton Pitre receives training on donning an M50 gas mask from Sgt. Joshua Webb, assigned to the 24th Marine Expeditionary Unit (MEU), during a simulated chemical and biological attack during a general quarters drill aboard the Wasp-class amphibious assault ship USS Iwo Jima (LHD 7), April 14, 2021. Iwo Jima is operating in the Celtic Sea with Amphibious Squadron 4 and the 24th MEU as part of the Iwo Jima Amphibious Ready Group. (U.S. Navy photo by Mass Communication Specialist 2nd Class Joshua D. Petrosino)