U.S. Marine Corps Sgt. Shane Franzen, a combatant diver with 3d Force Reconnaissance Company, 4th Marine Division, Marine Forces Reserve, adjusts his buoyancy compensator while submerged during dive training in Mobile, Alabama, Sept. 23, 2021. Dive training allows the Marines with 3d Force Reconnaissance Co. to have multiple means of amphibious insertions, allowing them to conduct multi-domain reconnaissance, limited scale raids, or deny the enemy freedom of movement in designated areas. (U.S. Marine Corps photo by Cpl. Brendan Mullin)