A U.S. Marine with 2nd Amphibious Assault Battalion, observes ocean tides before conducting an Amphibious Warfare Certification exercise on Onslow Beach, Camp Lejeune, N.C., March 12, 2014. The exercise was conducted to strengthen the units proficiency in an amphibious environment. (U.S. Marine Corps photo by Cpl. Nicholas T. Nohalty, 2nd MARDIV, Combat Camera/Released)