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In the military, we categorize the four basic principles of survival as protection, location, water, and food. Protection focuses on your ability to prevent further injury and defend yourself against nature and the elements. Location refers to the importance of helping others to rescue you by letting them know where you are. The principle of water focuses on making sure that even in the short term, your body has the water it needs to enable you to accomplish the first two principles. Food, while not a priority in the short term, becomes more important the longer your situation lasts. We teach the principles in this order, but their priority can change depending on the environment the condition of the survivor, and the situation in which the survivor finds him- or herself.