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You answered your own question: military applications.

The US Armed Forces would pay a LOT of money to move 100+ tons of personnel and materiel anywhere on earth with a flat landing spot in under 60 minutes.

You could have tanks on the ground that were fully operational in under 3 hours (probably half that if they left the BFR packed and fueled for takeoff at all times), or a disaster recovery base set up within 24 hours of the winds dying down (to pick a more topical example.)

Maybe, though the military has studied similar ideas before and nothing has ever come from it, so I'm sceptical they're going to throw the kind of funding at it that would be required here. As a general concern, actual travel time doesn't usually seem to be the main determinant of how fast military forces can be deployed.

But who knows. The idea of a big capsule coming down in a war zone and a bunch of tanks and marines rolling out certainly seems pretty cool, and I'm sure Musk and his lobbyists will at least try and convince the DoD that its something worth throwing a lot of $$ at.

Its not "anywhere on earth with a flat landing spot" if you want to be able to retrieve the thing. It either needs to go somewhere with the very specialized launch infrastructure and personnel it needs or the ability to transport (how to you transport a 48m x 12m cylinder?) it to somewhere that does.

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