Check the listing for details. VS-41 Shamrocks Squadron Patch – Hook and Loop, 4". Listed at 14.95 USD. VS-41 Shamrocks Squadron Patch Aviators! Enjoy this VS-41 Shamrocks Squadron Patch! It is a great patch to display and or wear! 4.0 inches Embroidered Hook and Loop US Naval Aviator Owned Business VS-41, Sea Control Squadron 41 was a training squadron of the United States Navy for crews of anti-submarine aircraft and was established on 30 June 1960 as an "anti-submarine squadron". The squadron was nicknamed Shamrocks and based at the Naval Air Station North Island, California (USA). VS-41 was originally activated in 1960 to train the crews of Grumman S-2 Tracker anti-submarine aircraft for the United States Navy. Two squadrons equipped with the Tracker were based each on the anti-submarine carriers (CVS) of the Essex-class to counter the threat of the large Soviet submarine fleet. In the mid-1970 both the CVS-carriers and the S-2 Tracker were phased out.