Roosevelt, Nimitz carrier strike groups conduct dual carrier operations in South China Sea February 9 The aircraft carrier Nimitz leads a formation of ships from the Nimitz and Theodore Roosevelt Carrier Strike Group during dual carrier operations. (U.S. Navy photo by Mass Communication Specialist 2nd Class Markus Castaneda) Aircraft carriers Theodore Roosevelt and Nimitz, along with their carrier strike groups, conducted dual carrier operations Tuesday in the South China Sea — marking the first time since July 2020 the U.S. has partaken in such operations there. The carrier strike groups completed a series of exercises designed to facilitate interoperability, among other things, according to the U.S. Navy.