In this Oct. 26 2015, photo provided by the U.S. Navy, Riverine Command Boat (RCB) 802, assigned to Combined Task Group (CTG) 56.7, conducts patrol operations in the Persian Gulf. Iran was holding 10 U.S. Navy sailors and their two boats, similar to the one in this picture, on Jan. 12, 2016, after the boats had mechanical problems and drifted into Iranian waters. American officials have received assurances from Tehran that they will be returned safely and promptly. (Torrey W. Lee/U.S. Navy via AP)