You don’t hear about every mission. And that’s the point.
Origins of the SAS: How a desert experiment changed modern warfare
It began in 1941—not with a grand strategy, but out of necessity. David Stirling, a young British officer with a rebellious streak and a knack for improvisation, proposed a radical idea: instead of fighting head-on across vast North African deserts, why not sneak behind enemy lines and destroy aircraft on the ground? The conventional generals laughed. The idea was absurd. Too risky. Too unorthodox. But someone, somewhere, said yes. And that changes everything. The SAS was born not from doctrine, but from desperation and ingenuity.
Special Air Service wasn’t just a new unit—it was a new philosophy. Speed, surprise, and precision replaced brute force. They operated in small teams, often behind enemy lines for weeks, living off the land, calling in strikes, sabotaging supply lines. Their first major success? Destroying over 40 enemy aircraft in a single night. The Germans didn’t even know who hit them. That kind of invisibility became the SAS hallmark. It’s a bit like a sniper’s approach to warfare—minimal noise, maximum impact.
But let’s be clear about this: their legacy isn’t just in kills or captures. It’s in influence. Nearly every modern special operations force—from the U.S. Delta Force to France’s GIGN—has studied or modeled parts of their doctrine. The thing is, the SAS didn’t just set a standard. They helped invent the category.
Founding principles that still shape elite units today
Stirling’s original blueprint had three pillars: autonomy, adaptability, and deniability. Teams were small—often four to six men—given a mission and left to execute it with minimal oversight. This wasn’t just tactical; it was psychological. It demanded soldiers who could think, lead, and survive on their own. That level of trust was revolutionary at the time. Most armies in the 1940s ran on rigid hierarchies. The SAS flipped the script.
From WWII to counterterrorism: Evolution of a legend
After the war, the SAS was disbanded—twice. Then revived, again, out of necessity. The Malayan Emergency in the 1950s brought them back. So did the Oman conflict in the 60s. But it was the 1980 Iranian Embassy siege in London that catapulted them into global fame. The live television footage of black-clad figures rappelling down the building, breaching rooms in seconds, neutralizing terrorists—within 17 minutes—was unlike anything the public had seen. Overnight, the SAS became myth. And myths are hard to measure objectively.
The selection process: Is it the toughest in the world?
Selection lasts six months. It’s voluntary. Eighty percent fail. Some drop out within days. Others make it to the final phases only to collapse from exhaustion, injury, or sheer mental fatigue. The infamous “Fan Dance” across the Brecon Beacons—a 15-mile march with full kit over treacherous terrain—has claimed lives. Hypothermia. Heatstroke. One recruit died in 2013 during winter selection. Another in 2015. These aren’t rumors. They’re official records. And that’s just the field phase.
Before that, you face psychological screening, physical tests, and a grueling week of endurance marches known as “the hills.” Candidates carry up to 55 pounds (25 kg), navigate with map and compass, and sleep little. One officer described it as “a test of loneliness as much as strength.” Because you’re not just fighting the mountain. You’re fighting your own brain telling you to quit. SAS selection isn’t about who’s the strongest. It’s about who can suffer the longest and still move forward.
But is it tougher than U.S. Navy SEAL BUD/S? Or Russia’s Spetsnaz training? Data is still lacking—most nations don’t publish completion rates or training details. What we do know: SEAL BUD/S has a similar dropout rate (75–80%). The French Commandos Marine have a four-week selection with extreme sleep deprivation. The Israeli Sayeret Matkal? They don’t even publish their process. So while the SAS is certainly among the hardest, claiming it’s the hardest is more about perception than proof.
Physical endurance: What the body can survive
Recruits march 30–40 miles a week during selection. They swim in freezing water. They run at altitude. Their VO2 max is routinely above 60 ml/kg/min—comparable to elite marathoners. Yet stamina alone won’t save you. One failed because he couldn’t navigate in fog. Another because he froze during a simulated interrogation. The issue remains: mental resilience often matters more than muscle.
Psychological screening: The mind under pressure
The SAS uses classified psych evaluations, but former candidates describe interviews probing fear, loyalty, and moral boundaries. “Would you kill a civilian to save five hostages?” “Can you follow an order you think is wrong?” These aren’t hypotheticals. They’re filters. Because in real ops, the line blurs. And that’s exactly where breakdowns happen.
SAS vs. Delta Force: How do the world’s top units compare?
Different tools. Different jobs. The U.S. Army’s Delta Force—officially 1st SFOD-D—was created in 1977, directly inspired by the SAS. Their founder, Colonel Charlie Beckwith, trained with the SAS in the 60s and came back convinced America needed its own tier-one unit. He got it. But while Delta focuses heavily on direct action and hostage rescue (like the 2011 raid that killed Osama bin Laden), the SAS has historically balanced reconnaissance, sabotage, and long-term covert operations.
Budgets differ wildly. Delta reportedly has over $1 billion in annual funding. The SAS? Exact numbers are classified, but estimates suggest a fraction of that. Yet both have comparable success rates in counterterrorism. Between 2001 and 2021, the SAS conducted over 200 high-value target operations in Afghanistan and Iraq. Delta? Around 180. The problem is, we’re comparing shadows. Records are redacted, missions classified.
Special forces effectiveness isn’t measured in body counts. It’s in strategic disruption. Did the mission degrade enemy capabilities? Prevent attacks? That said, the SAS has a reputation for discretion. Delta for firepower. Neither is better. Just different. Like comparing a scalpel to a laser—both precise, but in different ways.
Mission profiles: Covert ops vs. direct action
The SAS has embedded with rebel groups in Syria. Operated in Yemen under diplomatic cover. Trained Ukrainian forces before the 2022 invasion. Their work is often invisible by design. Delta, meanwhile, is more likely to storm a compound. Fast. Loud. Final. Because the political context differs. The UK often prefers plausible deniability. The U.S., especially post-9/11, has leaned toward visible deterrence.
Training exchange: Allies learning from each other
The two units train together regularly. SAS instructors helped develop Delta’s initial selection course. Today, they exchange tactics on hostage rescue, urban combat, and survival. France’s GIGN, Australia’s SASR, even Jordan’s King Abdullah II Special Forces Brigade—all have trained with or been influenced by the original SAS. It’s less a rivalry, more a global network of elite skill-sharing.
Why the SAS reputation might be overrated
I find this overrated. Not their capability—never that. But the myth. The idea that they’re unbeatable. In 2005, six SAS operatives were captured in Iraq while on an unauthorized mission. Disguised as civilians, they were accused of espionage. It caused a diplomatic crisis. In 2012, a patrol in Afghanistan walked into an ambush. Three killed. Were they outmaneuvered? Or just unlucky? We don’t know. The thing is, every unit has failures. The SAS just doesn’t advertise them.
And that’s the danger of legend. It obscures reality. Other units—like Russia’s FSB Alpha Group or Israel’s Shayetet 13—rarely get the same spotlight, despite comparable or even superior performance in their regions. Shayetet 13 raided a Hezbollah base in 2006, 20 miles inside Lebanon, in under 12 minutes. Zero casualties. No media. No documentaries. Just results. So why is the SAS more famous? Marketing. History. The BBC. Honestly, it is unclear whether they’re better—or just better known.
Frequently Asked Questions
How long is SAS selection?
Officially six months, split into phases: pre-selection, basic fitness, field training, and final evaluation. Most drop out during the first three weeks. The average weight loss among candidates is 10–15 pounds (4.5–7 kg).
Can foreigners join the SAS?
Only British, Commonwealth, or Irish citizens eligible for UK military service. Even then, you must serve at least three years in another regiment first. No direct entry. No exceptions.
Has the SAS ever failed a mission?
Public records are sparse, but known setbacks include the 1980 Loughgall Ambush (eight members killed), the 2005 Iraq capture, and a 2011 Libya operation where a team was extracted early due to compromised intelligence. Failures are rarely admitted. But they happen.
The Bottom Line: Is the SAS the best military unit?
Defining "best" is the trap. By fame? Undoubtedly. By influence? Possibly. By operational secrecy and consistency? Strong case. But so are others. The U.S. Navy SEALs have more global reach. Israel’s Sayeret Matkal has higher per-capita success in counterterrorism. Russia’s Spetsnaz excel in asymmetric warfare. Each has strengths shaped by their nation’s threats, budgets, and doctrines.
The SAS pioneered modern special operations. That’s not up for debate. They’ve pulled off missions that seem fictional. Yet to claim they’re the best ignores context. It’s like saying Ferrari makes the best car—yes, on a track. But not for off-roading. Not for city commutes. Elite military units aren’t universal tools. They’re specialized instruments.
My stance? The SAS is among the top three. Maybe top two. But declaring a single “best” is a journalist’s game, not a strategist’s. Because in the shadows—where these units operate—reputation means nothing. Results do. And the SAS, for all its myth, delivers where it counts. That’s enough. We’re far from it if we think rankings capture the full picture.
Because in the end, it’s not about who’s number one. It’s about who gets the job done when no one else can. And on that front? The SAS has earned its place. Just not its pedestal.