Add a rare and cryptic piece of Cold War intelligence and security history to your collection with this vintage S.I.N. cut-edge shoulder patch. Featuring a split olive and blue shield, a detailed teal multi-directional compass arrow design, and an embroidered unit scroll, this distinctive insignia represents secretive military intelligence operations. An exceptional and hard-to-find piece for tactical insignia historians, intelligence branch memorabilia collectors, and vintage patch enthusiasts.