U.S. Marine Corps Lance Cpl. Simon Tumbleson, a squad leader with Golf Company, 2nd Battalion, 23d Marine Regiment, 4th Marine Division, poses for a photo during a conditioning hike during Mountain Training Exercise 4-23 at Marine Corps Mountain Warfare Training Center in Bridgeport, California, June 13, 2023. Marines begin MTX by conducting conditioning hikes to acclimate to their environment in preparation for increasingly difficult training that will prepare them for the challenges of operating in a mountainous environment. Tumbleson is a native of Valencia, CA. (U.S Marine Corps photo by Lance Cpl. Samwel Tabancay)