Marines buy food, protein powders, hygiene gear and other useful items from a mobile exchange, Sept. 25. Marines with Combat Logistics Regiment 15 travel throughout the area to Marines, bringing them the services of a regular store. - Marines buy food, protein powders, hygiene gear and other useful items from a mobile exchange, Sept. 25. Marines with Combat Logistics Regiment 15 travel throughout the area to Marines, bringing them the services of a regular store.