In a world dominated by violent media, Americans are no more eager to go to war than they were in the 1980s or the 1960s or the 1940s. Hasn't it always been someone else's problem?
The overwhelming majority would rather go on thinking it had nothing to do with them and there...
When outnumbered, find cover and keep your forces close together.
You can pack motorised infantry up into a truck for moving longer distances, but packing and unpacking means you can't attack on that go.