Marines line up for a door-breaching exercise using a water charge during Operation Lava Viper at Pohakuloa Training Area, Hawaii, May 28, 2015. Marines line up for a door-breaching exercise using a water charge during Operation Lava Viper at Pohakuloa Training Area, Hawaii, May 28, 2015. SHARE: Download: Full Size (1.95 MB) Tags: Photo Essays Credit: VIRIN: 304920-K-FQW99-725.jpg Photo Gallery