Keywords: SH-3A of HS-4 hovers over submarine c1968.jpg A U S Navy Sikorsky SH-3A Sea King from Helicopter Anti-Submarine Squadron 4 HS-4 Black Knights hovers over a submarine The submarine appears to be a fleet snorkel -modernized Balao/Tench-class submarine HS-4 was assigned to Carrier Anti-Submarine Air Group 55 CVSG-55 aboard he aircraft carrier USS Yorktown CVS-10 for a deployment to the Western Pacific and Vietnam from 28 December 1967 to 5 July 1968 U S Navy photo http //www navysite de/cruisebooks/cv10-682/205 htm from the http //www navysite de/cruisebooks/cv10-682/index_021 htm USS Yorktown CVS-10 1967-1968 cruise book available at http //navysite de/cruisebooks/index html Navysite de ca 1968 U S Navy PD-USGov-Military-Navy SH-3A Sea King Helicopter Anti-Submarine Squadron 4 United States Navy |