Tunnel Travel A Marine walks through a tunnel during a live-fire exercise at Marine Corps Base Camp Pendleton, Calif., Oct. 3, 2023. The tunnel allows troops to move safely between firing ranges during training. SHARE: Download: Full Size (0.39 MB) Tags: Marine Corps Credit: Marine Corps Lance Cpl. Francisco Angel VIRIN: 231003-M-HE928-1207Y.JPG Photo Gallery