Trainees test backpack water pouches
LACKLAND AIR FORCE BASE, Texas -- Trainee Latoya Warren drinks water from a canteen as Trainee Mike Thomas sips water from a tube leading to his backpack water pouch. They are in the third week of basic military training in the 322nd Training Squadron and are part of a yearlong study to determine which method of drinking water is more beneficial. (U.S. Air Force photo by James Coburn)