Tunnel Travel Marines patrol an underground tunnel as part of offensive operations during an exercise at Camp Stanley, South Korea, March 10, 2025. The semiannual exercise allows U.S. and South Korean marines to train together, improving combined capabilities to deter threats and maintain peace. SHARE: Download: Full Size (1.52 MB) Tags: partnerships, Marine Corps, Indo-Pacific Credit: Marine Corps Lance Cpl. Kendrick Jackson VIRIN: 250310-M-KJ552-1041F.JPG Photo Gallery