Lance Cpl. Darrin Reddingus, a rifleman with India

Lance Cpl. Darrin Reddingus, a rifleman with India Company, Battalion Landing Team, 3rd Battalion, 5th Marines, sets up a trip flare during Military Operations in Urbanized Terrain (MOUT) training at Andersen South Air Force Base, Guam, September 1, 2017. A trip flare is a trap that reveals the enemy’s position when the enemy crosses a barely visible wire that triggers a flame signal. Marines with BLT 3/5 train regularly in different environments to maintain their readiness as the Ground Combat Element of the 31st Marine Expeditionary Unit. The 31st MEU partners with the Navy's Amphibious Squadron 11 to form the Bonhomme Richard Expeditionary Strike Group, providing a cohesive blue-green team capable of accomplishing a variety of missions across the Indo-Asia-Pacific region. (U.S. Marine Corps photo by Cpl. Amaia Unanue/Released)