Thats right, the US military has no significant tasks in the US proper (unless we are talking about a Civil War). And its very unlikely to have such problems in this hemisphere.
So what is the US military for? Sincere question. I would like to see your answer.
Under these circumstances, its obvious that its structure is designed with the assumption that its principal tasks are to fight wars the next ocean over, or further.
Is the Spanish military supposed to be patrolling the borders here in the US.
Honest hypothetical there, are they?