 Complete the following phrase:  On December 20, 1985, the charges were laid out in an Associated Press article after an extensive investigation which included interviews with officials from the Drug Enforcement Administration DEA, Customs Service, Federal Bureau of Investigation FBI and Costa Ricas Public Security Ministry, as well as rebels and Americans who work with them. Five American Contra supporters who worked with the rebels confirmed the charges, noting that two Cuban-Americans used armed rebel troops to guard cocaine at clandestine airfields in northern Costa Rica. They identified the Cuban-Americans as members of the 2506 Brigade, an anti-Castro group that participated in the 