181123-M-CO500-183 SIERRA DE RETIN, Spain (Nov. 23, 2018) U.S. Marines with Special Purpose Marine Air-Ground Task Force-Crisis Response-Africa and Spanish marines arrive in landing craft utility boats during GRUFLEX in Sierra De Retin, Spain, Nov. 23, 2018. GRUFLEX is a multinational amphibious exercise led by the Spanish navy that focuses on enhancing multilateral tactics and building partner relations through shared training events. SPMAGTF-CR-AF is a rotational force deployed to conduct crisis-response and theater-security operations in Europe and Africa. (U.S. Marine Corps photo by Sgt. Katelyn Hunter/Released)