BORDER PATROL U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, speaks with Maria Valencia, a U.S. Border Patrol agent, at a stop to observe the U.S. - Mexican border while in El Paso, Texas, April 17, 2009. Mullen also visited Joint Task Force-North to better understand the current situation and violence that is plaguing the region. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 126519-T-XTB84-188.jpg Photo Gallery