Yes , I believe that you are correct. In fact I am amazed at all the variations of the Yankee class. You have Yankee 1 and 2 variants, Yankee notch, yankee sidecar, Yankee SSN, Yankee pod, Yankee stretch and Yankee big nose. The Russians were a busy bunch.
There are OLD pilots and there are BOLD pilots but there are very few OLD BOLD pilots. MAG