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With upcoming satellite internet projects (see Starlink), I think it will be highly unlikely to disconnect any army base totally from the internet. In such scenarios, any centralized service would be much more efficient, secure and convenient. Soldiers can also use cryptocurrencies for trade among themselves, without needing to carry cash.

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So what about during war when the enemy may have shot down your sats? Your soldiers are still going to want to buy goods on base during their down time and morale will suffer if you just tell them the internet is down.

How many will they shoot down? SpaceX is launching them by hundreds every month. The end goal is 45000 satellites. And by shooting just a few, the enemy will maybe only slow down the internet, not turn it off completely.

Let that sink in. They'll need 45000 missiles up shoot down every starlink satellite. Also, SpaceX will definitely be launching new ones as they are being shot down. So it's a very impractical approach.

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