They aren't allowed to here. Learn the laws of this country.
sorry...but the DoD CAN provide our border agents with military assistance to protect our borders...
maybe you remember Operation Jump Start when Bush sent 6,000 troops to assist the border patrol...2006-2008...
in 2010 even Obama used an executive order to send 1200 troops down there....Operation Phalanx, ended 2011...
Army National Guard Operation Phalanx | Article | The United States Army
Obama needs to use his 'pen and phone' again and send several thousand more soldiers to help out....to provide all kinds of assist....ground surveillance, criminal investigative analysis, command and control, mobile communications, transportation, logistics, and training support...
he could also go to Congress and get approval for even more U.S. armed forces to stop this invasion....doubtful that'll ever happen...