Because people are trying to kill you.
Imagine if we live in a sci-fi future and there are these alien tanks that randomly patrol the wilderness hunting down what;s left of humanity. You have a house, wife, and kid in those woods that you are trying to protect. So.. because you don’t want the house getting shot up by alien tanks every day you go out a few miles – well out of sight of the house – and set up to watch for tanks. If you see one you can shoot it before it gets to the house.
Sound good so far? Well what happens when you need to get a bite to eat or take a piss? Are you going to go home? No… you will piss in the woods. You will bring a packed sandwich. That’s mid-air refueling.
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