U.S. Assistant to the President Barack Obama for Homeland Security and Counterterrorism John O. Brennan, left, and U.S. Air Force Gen. Victor E. Renuart Jr. watch a helicopter during a ceremony in Mexico City, Tuesday, Dec. 15, 2009. The U.S. government has given Mexico five helicopters to use in its fight against drug cartels. (AP Photo/Eduardo Verdugo)