The Special Reconnaissance Regiment (SRR) is a tier 1 special reconnaissance unit of the British Army. It was established on 6 April 2005 and is part of the United Kingdom Special Forces (UKSF).

The Special Air Service (SAS) is a special forces unit of the British Army. It was founded as a regiment in 1941 by David Stirling, and in 1950 it was reconstituted as a corps. The unit specialises in a number of roles including counter-terrorism, hostage rescue, direct action and special reconnaissance. Much of the information about the SAS is highly classified, and the unit is not commented on by either the British government or the Ministry of Defence due to the secrecy and sensitivity of its operations.