United States citizens abroad, even when associated with the military, cannot be deprived of the protections of the Constitution and cannot be made subject to military jurisdiction. Decided June 10, 1957 (argued May 3, 1956). Opinion of the Court: Hugo Black → go there Dissenting: Clark. Topic: Other areas. Reid v. Covert, 354 U.S. 1 (1957), is a 6–2 landmark decision of the United States Supreme Court holding that United States citizen civilians outside of the territorial jurisdiction of the United States cannot be tried by a United States military tribunal, but instead retain the protections guaranteed by the United States Constitution, in this case, trial by jury. Additionally, a plurality of the Court also reaffirmed the president’s ability to enter into international executive agreements, though it held that such agreements cannot contradict federal law or the Constitution. Wiki link