Keywords: S2F-1 VS-21 CVS-37 firing HVARpac NAN7-56.jpg A Grumman S2F-1 Tracker of anti-submarine squadron VS-21 Lightning Bolts attacking a submarine with HVAR rockets during a maneouver in the Pacific in 1956 VS-21 was assigned to the U S anti-submarine aircraft carrier USS Princeton CVS-37 U S Navy Naval Aviation News June 1956 http //www history navy mil/nan/backissues/1950s/1956/Jun56 pdf 1956 USN PD-USGov-Military-Navy Grumman S-2 Tracker Sea Control Squadron 21 United States Navy HVAR rocket 1956 |