U.S. Marine Cpl. Benjamin Hartsell, foreground, demonstrates the proper kneeling position while providing security for his squad during the patrolling portion of a military tactics training and exchange, part of a theater security cooperation engagement at Welissara Naval Base, Sri Lanka, March 29, 2017. Hartsell is a rifleman assigned to Bravo Company, 1st Battalion Landing Team, 4th Marines, 11th Marine Expeditionary Unit. Marine Corps photo by Cpl. Devan K. Gowans