“It helps determine which troops are ... ummm ... “reliable”.”
That was my first thought. Call me a kook but I can’t think of any other practical reason for such a military excercise.
Which troops are reliable...
...just how much will U. S. Citizens tolerate?
IMO, get used to it folks. Soon these won’t be training exercises any longer.
The decision to dedicate one division of the military to inside-border enforcement should make just about anyone sit up and take notice.