A U.S. Marine attached to Alpha Company, 1st Battalion 3rd Marines throws an M69 practice grenade into a trench during a company size assault on Range 10 during Operation Lava Viper aboard Pohakuloa Training Area, Hi., May 21, 2015. Alpha Company is the first to assault range 10 as a company. Range 10 has only previously been used for Platoon size assaults.