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The U.S. spends about half of its annual budget on defense, an equation that has resulted in some of the most innovated inventions coming from the military sector. 

Military innovation isn't an American or new phenomenon, however, some of the greatest advances in human history have been a result of our species figuring out more efficient ways of killing each other.

Digital photography, virtual reality, the Deep Web and the internet itself are just some of the everyday technologies that were born from military research.

Just keep in mind that not all of those advancements make for valuable military collectibles:

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With that said, here are 30 of history's most innovative military innovations: