SOUTH PADRE ISLAND, Texas - J.R. Stafford, a member of the Exercise Support Team at Exercise Support Branch Alameda, Calif., briefs members of the MEXUS exercise at the Isla Grand Beach Resort, Apr. 26, 2012.The annual MEXUS drill involves hundreds of participants from Gulf Coast states and Mexico, in which a major oil spill threatens both Mexican and U.S. coastal areas. Official U.S. Coast Guard photo by Petty Officer 3rd Class Richard Brahm.