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At the time of Nautilus’s launching back in January, the Caribbean Sea Frontier, an area command with bases in San Juan, Trinidad, Guantánamo, and Aruba-Curaçao, had begun running air-sea patrols in the Gulf of Honduras after the leftist government of Guatemala requested arms from the Soviet bloc in reaction to a U.S. decision to give covert support to an antigovernment “liberation” movement. To protect Honduras from invasion and to monitor and regulate arms shipments into the region in violation of the Monroe Doctrine, which had since 1823 warned European powers against meddling in the Western Hemisphere, the United States airlifted arms to Honduras. On May 20, the first Soviet arms shipment arrived in Guatemala. A few days later, the commander in chief of the U.S. Atlantic Fleet ordered a contingency evacuation force into the area comprised of an antisubmarine carrier and five amphibious ships with a Marine battalion embarked. On June 18, the United States announced an arms embargo against Guatemala. The crisis ended eleven days later with a U.S.-backed coup that installed a new government under the dictator Carlos Castillo Armas.
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James D. Hornfischer (Who Can Hold the Sea: The U.S. Navy in the Cold War 1945-1960)