When it comes to holding your own in the wild, few groups know their stuff like the U.S. Army. Now you can tap into their wealth of knowledge with Army Survival. This handy app is based on the U.S. Army Field Manual 21-76, titled "Survival", and offers up information on survival psychology, edible and medicinal plants, poisonous plants, dangerous animals, insects, and other natural threats, shelters, wayfinding, and general survival tips for the desert, tropics, arctic, and sea, as well as a host of high-resolution images to make the standard manual even more useful. The only downside? The app can't keep your phone charged up if you're in the wilderness and actually need the info it contains.