 The U.S. Department of Defense leased 6 UH-1 Huey helicopters, and provided flight training to Bolivian air force pilots and Special Forces training for UMOPAR and DEA agents.Operation Snowcap recruited U.S. Army infantry officers attending the Army Infantry Officer's advanced course in the late 1980s.Senior lieutenants and captains attending the course were given classified briefings attempting to recruit them from the Army to participate for operations in Bolivia and Peru.