Cave Watch U.S. Marines watch the mouth of a cave into which an explosive charge was thrown to see if any Japanese soldiers will try to escape. This was one of the many bitterly contested cave positions found in Okinawa’s numerous ridges and hills during World War II. SHARE: Download: Full Size (0.23 MB) Credit: Marine Corps photo VIRIN: 210428-M-DO439-050A.JPG Photo Gallery