Against what (whom)?
What kinds of wars, and where?
We already have that (control, which is different from defence).
Devil's Advocate: to resist whom, and given that, what would be the point of resistance movements - what would an occupier change that merits loss of life and sabotage (which presumably would include sabotage of our own infrastructure)?
I ask these questions because unless we're about to abandon NATO and become isolationist ourselves, we already are pointed in the direction we should continue moving with our commitments and capabilities. And I don't see much point fighting a war to restore anything that falls under the heading "nostalgic attachments", or for particular social programs or wealth transfer schemes.
Trump's juvenile verbal provocations (51st state, Governor Trudeau, etc) don't move me. They might move others, but don't constitute reasons to throw out the baby.