Water bladders, which can hold up to 3,000 gallons of purified water and belong to a water purification detachment from 8th Engineer Support Battalion, 2nd Marine Logistics Group, sit near Mott Lake, Fort Bragg, N.C., March 15, 2013, during the joint training exercise Rolling Thunder. The detachment used a tactical water purification system to purify water for 10th Marine Regiment, 2nd Marine Division to decrease the amount of time the regiment would need to receive drinkable water.