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The marginal benefit of the so-called 800th base is giving planners and operations officers options in a crisis. The more places you either have your own infrastructure or access agreements or leases with a host country, the more you can a) disperse your force and complicate targeting when on the defensive and b) have multiple avenues of approach when on the offensive.

If the enemy knows all your forces have to flow into theater via airlift landing at Krablakistan Air Base in Elbonia, they're going to make war plans involving targeting your transports and pounding the living shit out of Krablakistan Air Base with air strikes and/or ballistic missiles. And beforehand, they'll do their level best to sow discord between your government and the Elbonians to the point they reconsider your access to their base in a crisis.