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I like some authors' assertions that jurisdictions have to be clear-cut because otherwise the 'space force' just takes over everything. They have the high ground, so to speak, especially in SF where there is any value in off-planet activities (colonization or alien trade).
On air force versus navy, in some SF we see an awful lot of air-bouyant craft (e.g. dirigibles), which stay in the air as easily as a ship stays afloat in water.
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