Lance Cpl. Austin L. Eilerman, a mortarman with India Company, Battalion Landing Team, 3rd Battalion, 5th Marines, holds his M4 carbine inside an Assault Amphibious Vehicle during an amphibious raid as part of the 31st Marine Expeditionary Unit’s Certification Exercise in Freshwater Beach, Shoalwater Bay Training Area, Queensland, Australia, August 16, 2018. Marines with BLT 3/5, the Ground Combat Element of the 31st MEU, cleared and secured the area for humanitarian assistance-disaster relief training. BLT 3/5 is exploring state-of-the-art concepts and technologies as the dedicated force for Sea Dragon 2025, a Marine Corps initiative to prepare for future battles. The 31st MEU and Amphibious Squadron 11 are conducting CERTEX, the final evaluation in a series of training exercises which ensures readiness for crisis response throughout the Indo-Asia-Pacific region. (U.S. Marine Corps photo by Cpl. Amaia Unanue/Released)