If you have a survival, or bug-out bag, ready for the times when you have to grab your gear and go, you might want to pick up some Tactical Sandwiches (or in this case a Tactical Sammich). Supposedly they taste pretty good and come in two flavors (Honey BBQ beef and pepperoni). The sandwiches are less than 300 calories each and have a whopping two year shelf life. More details after the break.
You get buy your tactical sammich at ThinkGeek here.