This was later changed (1959) and the subs were reclassified into "Fast Attack" subs as opposed to their older designation of Attack (Hunter-Killer) Submarines. These three patches are exceedingly rare. Please consider viewing my other listings (there are only about 40) and adding me to your favorites list as I will be listing many more interesting and unusual items throughout the summer. USN Korean War Era K-1, Hunter-Killer, Submarine Patch" is in sale since Thursday, June 01, 2017.This item is in the category "Collectibles\Militaria\Korea (1950-53)\Original Period Items". The seller is "winghunter" and is located in Lively, Virginia. This item can be shipped to United States.