Trump has no experience in elected office. There is nothing to go on except what he says. If he says crazy s__t that frightens people then we should be afraid.
Trump's overall plan for the economy is to cut taxes and continue spending. I can decline overtime at work(or take time off) and then also buy expensive merchandise. This idea makes sense. Eating lots of pie appeals to many people. Eating the pie does "make sense". If someone starts talking about eating a pie and still saving it for later then it is time to question judgements. A statement "I will eat pie" is coherent but that will not make it nutritious.
Compare defending Tokyo from 1945 to 2005 and defending Guam/Manila/pearl 1922 to 1942. A lot of naval historians wrote detailed books on this topic. I believe your suggestion to use the U.S. military as a mercenary corporation is actually your own.