UK Special Forces (Reserve)



21 & 23 SAS are an integrated part of the United Kingdom Special Forces (UKSF) group comprising regular and reserve units, operating at the strategic and operational level. They operate in difficult and often changing circumstances, where the requirement for maturity and sound judgement is paramount.



21 & 23 SAS accepts male and female applicants, with no previous military service. Applicants must be at least 17 years and 9 months or no older than 42 years 364 days when commencing enlistment into the Army Reserves. They are required to complete basic military training courses Alpha (TSC(A) – 1 week) and Bravo (TSC(B) – 2 weeks) (Phase 1) and the Combat Infantry Course – 2 weeks (Phase 2) before attempting SAS Reserves Selection.

Ex Regular applicants must be no older than 50 years 364 days on weekend 1, the Selection Induction Weekend (SIW) of SAS(R) Selection. This is so they are able to offer a 3-year return of service if they successfully pass Selection.

Applicants must be able to commit to intense and extended training demands and be willing to deploy overseas and commit to operations.


  1. Hills Prep Course

  2. Aptitude

  3. Standard Operating Procedures and Tactics Course

  4. Progressive training

Hills Prep Course
Hills Prep Course is a progressively arduous course of drill nights and weekends over several months, requiring a candidate to demonstrate mental and physical robustness. It is designed to prepare applicants for the rigours of the Aptitude phase.

Aptitude consists of a series of progressive marches against the clock, which culminates with a testing endurance march over arduous terrain.

Standard Operating Procedures and Tactics Course
On passing Aptitude, applicants will undertake a further six months training, over drill nights and weekends. This is an intensive period of instruction and assessment on Special Forces tactics, techniques and procedures, military skills form a major part of the programme. This is progressive, with the emphasis on individuals assimilating new skills, while under physical and mental pressure. On successful completion of the two-week final assessment exercise, applicants will be badged as SAS soldiers.

Progressive training
Following the completion of UKSF(R) Selection course, soldiers will enter a 24-month period of probation which will require the completion of a basic parachute course, a communication course and a Survive, Escape, Resist and Evade (SERE) course. On completion of the probationary period, soldiers will be eligible to be mobilised and deployed on operations. Training and skill development will be continuous throughout an SAS soldier’s career, reflecting the requirement to maintain a high level of proficiency in a diverse range of skills.

On successful completion of basic training the starting daily rate for an SAS Trooper is over £110 per day plus all the usual Reserve service incentives. Which includes an annual tax-free bounty, paid leave and pension.

Support Staff
21 & 23 SAS Support Sqn staff are not required to pass Selection; however, they must maintain a high level of fitness and commitment. Male and female applicants willing to transfer from other units Regular or Army Reserve should be aged 18 to 51 years and 364 days, have their Security Clearance in-place and hold full trade qualifications (Class 2 minimum) in their respective trades. The specific trades require you to have previously served or are currently serving within the armed forces. We do not accept Direct Entrants into the support roles.

• RLC Driver, Chef, Storeman
• RAMC RMO, Medic (CMT1)
• R Sigs Comm Sys Operator/Driver
• AGC (SPS) Clerk
• Int Corps Analyst
• REME Vehicle Mechanics and Armourers


21 & 23 SAS provide an opportunity for soldiers to work within a unique, diverse and exciting organisation with evolving operational roles. Service is physically and intellectually challenging, but the rewards are significant.

We are looking for self-motivated individuals with leadership potential and the ability to influence and serve on operations. In addition to a strong sense of purpose embracing the challenges of a complex world, 21 & 23 SAS provide challenge and adventure.

21 & 23 SAS units are located across the UK. To contact your nearest location, use the listed telephone points of contact or emails below.

21 SAS (R)

• London and South East
• Wales
• M3/M4 Corridor
• East Anglia
• South West

23 SAS (R)

• West Midlands
• North East
• North West
• Scotland (Lowland)
• Scotland (Highland)