In the neighborhood & state where one of my relatives lives, the sign of mil movement is more trains; he can hear the horns ..
This time of year, right after school’s out, reserve units all over the country, load up their heavy gear on trains and head for summer camp. 50-60 car trains are common. If you get a look at a load you can always tell the mission of the unit by the types of hardware. If you see visible firepower it might be different but the host base usually already has the ammo, etc.