Lance Cpl. Samuel Ricario, an automatic rifleman with

Lance Cpl. Samuel Ricario, an automatic rifleman with Company F, Battalion Landing Team, 2nd Battalion, 5th Marine Regiment, 31st Marine Expeditionary Unit, throws a training grenade from the kneeling position at Camp Hansen, Okinawa, Japan, Dec. 21, 2016. As the Marine Corps' only continuously forward-deployed unit, the 31st MEU air-ground-logistics team provides a flexible force, ready to perform a wide range of military operations, from limited combat to humanitarian assistance operations, through the Indo-Asia-Pacific region. (U.S. Marine Corps photo by Lance Cpl. Jorge A. Rosales/Released)