This undated photo provided by the U.S. Border Patrol shows an aerostat like those being tested along the U.S.-Mexico border, Wednesday, Aug. 22, 2012, near Roma,Texas. The Defense Depa

 

              This undated photo provided by the U.S. Border Patrol shows an aerostat like those being tested along the U.S.-Mexico border, Wednesday, Aug. 22, 2012, near Roma,Texas. The Defense Depa
This undated photo provided by the U.S. Border Patrol shows an aerostat like those being tested along the U.S.-Mexico border, Wednesday, Aug. 22, 2012, near Roma,Texas. The Defense Department has loaned the helium-filled surveillance balloons to Border Patrol to see if they could be as effective for border security as they were in war zones. (AP Photo/U.S. Border Patrol)