SASR 4th Sabre Squadron

Based in Nui Dat the SASR was responsible for providing intelligence to both the 1st Australian Task Force (1 ATF) and US forces, operating throughout Phuoc Tuy Province as well as Bien Hoa, Long Khanh and Binh Tuy provinces. From 1966 SASR squadrons rotated through Vietnam on year-long deployments, with each of the three Sabre Squadrons completing two tours before the last squadron was withdrawn in 1971. Missions included medium range reconnaissance patrols, observation of enemy troop movements, and long range offensive operations and ambushing in enemy dominated territory.[36][37][38][39] Operating in small groups of four to six men they moved slower than conventional infantry through jungle or bushland and were heavily armed, employing a high rate of fire to simulate a larger force on contact and to support their withdrawal. The primary method of deployment was by helicopter,[39] with the SASR working closely with No. 9 Squadron RAAF which regularly provided rapid and precise insertion and extraction of patrols into jungle landing zones at tree top height.[40] On occasion SASR patrols would also be deployed by M-113 armored personnel carriers (APCs) with a method devised to deceive the Viet Cong as to their insertion and the location of their drop-off point despite the noise they made moving through the jungle.[41] An operational parachute jump was also undertaken.[42][Note 1]
A fourth squadron was raised in mid-1966, but was later disbanded in April 1967. How ever it is rumoured that the 4th now operates off the books as the SASR black ops Squadron this inteligence can not be confirmed nor denied and a military liason officer stated and i quote " the 4th does not exsist"