170125-M-AS864-222 ATLANTIC OCEAN (Jan. 25, 2017) Cpl. Caleb Potter, assigned to India Company, 3rd Battalion, observes as Marines descend from the top of an elevator dock during a fast-roping exercise aboard the amphibious transport dock ship USS Mesa Verde (LPD 19) as part of a composite training unit exercise. The exercise is a compilation of training scenarios designed to solidify unit cohesion and refine operational efficiency prior to their upcoming deployment as an integrated unit. (U.S. Marine Corps photo by Gunnery Sgt. Adaecus G. Brooks/Released)