> Why just SF's?
> Why the SW of our country?
> What does the military/government hope to get out of these exercises?
> What can locals do to screw with the exercise?
SFs are about the best to take over an area, search it and confiscate all the weapons while inventorying stored supplies quick and neat, while moving civilians to FEMA type camps for proper protection.
SW of USA is the highest concentration of those items noted above.
Determinations of weaknesses and strengths of those plans along evaluation of the abilities to blend in and effectively be undercover in the local populace, with additional investigation of those suspected of not being properly loyal to the US govt.
Run trespassers off your real estate, if you can. Other than that, little. Just continue your belief that the US military is true to their oaths.
Nemo