It's bad enough that it's already DHS/ICE vs. all sane and decent people, but using the military to enforce civilian law would turn the people against the military.
Today, we're on a path to losing many of those hard-earned rights, and it will take collective action by all of us to force change again. Freedom and equality won't be gained through a single march or week-long boycott, it will again have to be...
Between the national protests, there are lots of local activities that you can be involved in, as well as other related activist groups who organize their own anti-Trump actions.