In 1965, 23,000 U.S. troops landed in the Dominican Republic to quash a military coup in what was the first U.S. military intervention in Latin America in more than 30 years. President Lyndon Johnson had ordered the invasion to stem what he claimed to be a "Communist threat", but the mission appeared ambiguous and was condemned throughout the hemisphere as a return to gunboat diplomacy. In 1983 the United States invaded Grenada to remove popular and charismatic left-wing leader Maurice Bishop. The United States maintains a naval military base in Cuba at Guantanamo Bay. The base is one of five unified commands whose "area of responsibility" is Latin America and the Caribbean. The command is headquartered in Miami, Florida.