USNS Coastal Sentry (T-AGM-15)
USS Somerset (AK-212) was originally a U.S. Navy Alamosa-class cargo ship built for service in World War II, and was later re-acquired from the U.S. Air Force in 1964 as the USNS Coastal Sentry (T-AGM-15), a missile range instrumentation ship.
Read more about USNS Coastal Sentry (T-AGM-15): Built in Sturgeon Bay, Wisconsin, Inactivity Due To War's End, Service As An Air Force Ship, Acquisition By The Navy, Inactivation