The Ready to Eat Pocket Sandwich was originally developed for the U.S. military and is currently incorporated into the “First Strike Ration” for Special Operations Forces. No refrigeration is required, and each sandwich is 270–360 calories. They have a three-year shelf life if maintained at 80° F or less. Nine sandwich varieties are offered for breakfast, lunch and dinner. They’re designed to be eaten straight from the pouch but can be heated.