Border Patrol agents in southern Arizona used a military Black Hawk helicopter to track down and arrest immigrants who were decked out in camouflage clothing as they illegally crossed from Mexico into the United States. Over the weekend, a UH-60 Black Hawk and UH-72 Lakota helicopter previously deployed to the U.S-Mexico border with National Guard troops were used in a remote area west of Tucson, Ariz., in order to give the agents on board a bird's-eye view of where people might be trespassing, according to U.S. Customs and Border Protection. Military pilots flew the helicopters while Border Patrol agents looked...