The initial twelve Atlantic Missile Range ships were modified World War II cargo vessels. Six were FS-type ships and six were C1-M-AV-1 vessels. All were equipped with telemetry systems. Two of the C1-M-AV-1 types, Coastal Sentry and Rose Knot, were equipped with command/control transmitters. The smaller FS types were retired by 1960. In 1964 the US Navy took over operation of the larger C1-M-AV-1 type, and redisgnated them as AGM. The original larger ORV were out of service on the Eastern Test Range by 1969.