A US National Guard vehicle guards covered under camouflage fabric sits atop a mountain next to the border fence near Sonoyta, Mexico, Thursday, July 29, 2010-- The 1,200 National Guard troops expected to arrive Sunday on the southwest border for reinforcement won't finish deploying until late September, federal officials say, stirring confusion and anger among Arizona lawmakers who thought the deadline was Aug. 1. President Obama announced in May he would send National Guard troops amid growing concerns about border violence stemming from illegal immigration and drug smuggling. Many called for a military presence along the U.S-Mexico border to...