"A U.S. Pathfinder ship has entered the Black Sea," the source said on condition of anonymity. USNS Pathfinder (T-AGS 60) is an oceanographic survey ship owned by Military Sealift Command and has a civilian crew and scientists on board. However, a Russian military source told RIA Novosti that ships of the Pathfinder class could be used for reconnaissance and intelligence gathering purposes. NATO sent at least five warships, including guided missile frigates, into the Black Sea after Russia completed its operation "to force Georgia to peace" on August 12. AP: Third US Navy ship heads for Georgia.