Marines with 1st Supply Battalion, Combat Logistics Regiment 15, 1st Marine Logistics Group, I Marine Expeditionary Force, provide logistical support for the Weapons and Tactics Instructor Course in Yuma, Ariz., Oct. 15, 2014. For more than a month, 1st Supply Bn. provided food, water, and other logistical services to the various forward operating bases where the WTI course Marines were operating. - Marines with 1st Supply Battalion, Combat Logistics Regiment 15, 1st Marine Logistics Group, I Marine Expeditionary Force, provide logistical support for the Weapons and Tactics Instructor Course in Yuma, Ariz., Oct. 15, 2014. For more than a month, 1st Supply Bn. provided food, water, and other logistical services to the various forward operating bases where the WTI course Marines were operating.