The Unit
The Special Air Service is the British Army's senior special-forces regiment and the template most of the world's tier-one units were measured against. Raised in the North African desert in 1941 by David Stirling as a small raiding force, it was disbanded after the Second World War and reborn through the Malayan Emergency into the regiment that exists today: 22 SAS, based at Stirling Lines, Credenhill, near Hereford.
Its remit runs from counter-terrorism and hostage rescue — burned into public memory by the 1980 Iranian Embassy siege — to reconnaissance, direct action and working far behind a line nobody else can reach. It sits under Director Special Forces alongside the SBS.
The Gate
There is no civilian route in. Selection is open to serving members of the UK Armed Forces — overwhelmingly from the Army, though all three services may apply — who have the time left to serve, a clean record and a recommendation. Most candidates arrive as fit, experienced soldiers and still fail.
You volunteer; you are not posted. What the regiment screens for on the way in isn't a single number but a floor of robustness — the aerobic base, load-carrying durability and navigation to survive the hills long enough for the real test, which is temperament, to show itself.
Selection
UK Special Forces Selection runs twice a year and lasts roughly six months across distinct, sequential phases. Each is pass-or-continue; there is no aggregate score that carries a weak phase.
Aptitude — The Hills
Build-up marches over the Brecon Beacons and Black Hills, distances and loads climbing against a tightening clock, navigating solo. It culminates in Endurance — "the Long Drag": roughly 64 km (40 mi) over the highest ground carrying ~25 kg plus rifle and water, inside about twenty hours. Most of the failures happen here.
Jungle
Survivors deploy to the jungle (historically Brunei or Belize) to be tested on living, navigating and operating in small patrols under relentless discomfort — discipline and standards maintained when no one is watching.
Escape, Evasion & Tactical Questioning
A final phase of escape and evasion on the run from a hunter force, ending in Resistance to Interrogation — sustained, supervised pressure to confirm a candidate holds the line when exhausted, cold and isolated.
Badged — or returned to unit
Pass rates are brutal: from intakes of ~150–200, a single-figure handful is a normal result. Failure means a quiet return to unit — and, for some, another attempt.
The Standards That Get You There
Selection itself is pass/fail on the whole course — there is no published PT chart that badges you. But the screening floor you need just to start with a chance maps to the Selection tier in this reference. Indicative gates, not the bar that gets you through.
Train To The Standard
The Gate's three-tier programme is built from gates like these. See the Selection tier — run, ruck, strength, water and land-nav — broken down by exercise.