180420-N-PC620-0005 U.S. 5TH FLEET AREA OF OPERATIONS (April 20, 2018) Ensign Joshua Olson, middle, assigned to the Arleigh Burke-class guided-missile destroy USS Donald Cook (DDG 75), plots a simulated casualty on a damage control plate during a general quarters drill aboard the Wasp-class amphibious assault ship USS Iwo Jima. Iwo Jima is homeported in Mayport, Fla., and is on a regularly scheduled deployment to the U.S. 5th Fleet area of operations in support of maritime security operations to reassure allies and partners, and preserve the freedom of navigation and the free flow of commerce in the region. (U.S. Navy photo by Mass Communication Specialist 3rd Class Michael H. Lehman/Released)