Lance Cpl. Spencer Zeisset, a rifleman with Battalion

Lance Cpl. Spencer Zeisset, a rifleman with Battalion Landing Team, 1st Battalion, 4th Marines, holds security during a live-fire range as part of the 31st Marine Expeditionary Unit's simulated Expeditionary Advanced Base Operations, Camp Schwab, Okinawa, Japan, March 13, 2019. Zeisset, a native of Bethalto, Illinois, graduated from Civic Memorial High School in May 2016 before enlisting in February 2017. Marines with the 31st MEU are conducting simulated EABO in a series of dynamic training events to refine their ability to plan, rehearse and complete a variety of missions. During EABO, the 31st MEU partnered with the 3rd Marine Division, 3rd Marine Logistics Group and 1st Marine Aircraft Wing, and airmen with the U.S. Air Force 353rd Special Operations Group. The 31st MEU, the Marine Corps' only continuously forward-deployed MEU partnering with the U.S. Navy's Amphibious Squadron 11, provides a flexible and lethal force ready to perform a wide range of military operations as the premier crisis response force in the Indo-Pacific region. (U.S. Marine Corps photo by Gunnery Sgt. T. T. Parish/Released)