A U.S. Marine with the 26th Marine Expeditionary Unit, from the USS Arlington (LPD-24) holds security with a Portuguese Marine at Pinheiro Da Cruz, Praia Da Raposa beach in Portugal, while participating in a combined amphibious assault exercise, as part of Trident Juncture 2015 Oct. 19. Trident Juncture is a NATO-led exercise designed to certify NATO response forces and develop interoperability among participating NATO and partner nations. (United States Marine Corps photo by Sgt. Austin Long/ Released)