A near CONSTITUTIONAL CRISIS came about when a US Coast Guard Airplane helping local authorities combatting the drug war was ordered to leave the country by Civil Aviation as the plane had not been authorized by Congress to be in the country. No armed plane or forces are allowed into the country under the 1949 Constitution Article 12, stating all armed forces were outlawed and the country’s security was exclusive to the police force. The Left has argued that the US Coast Guard is military and while no weapons were on the plane Civil Aviation didn’t want to risk legal procedures against themselves.
http://dialogo-americas.com/es/articles/rmisa/features/2015/05/26/feature-03