How would cutting off the supply of MICA affect our national security?
Compare/contrast.
With oil/fuel, we can't move our war machines.
Without MICA, we can't build new things.
So, the difference is, having war machines that will not move
-or-
having no spare parts once the existing spare parts were gone after the machines had been damaged.
In other words, we lose the oil, 25% of the country shuts down. Almost immediately. Including 25% of the military.
(am I the only one here that remembers the oil embargo?)
We lose the mica, some of the manufacturing shuts down. Eventually. 0% of the military (until AFTER we see combat and AFTER the current spare parts are used).