Marine Corps explores graywater capability to reduce logistical footprint - Combat Logistics Regiment 25 Marines unfold a 3,000 gallon water bladder during expeditionary water purification in support of Weapons and Tactics Instructors Course 2-18. Last spring, Marine Corps Systems Command explored a vendor prototype add-on module to the Lightweight Water Purification System that allows Marines to purify graywater for future use. (U.S. Marine Corps photo by Cpl. Nathaniel S. McAllister)