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Selection is reported to be the most demanding military training course in the British Armed Forces with a reported pass rate of Stock Photo - Alamy
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SAS forced to soften entry test after deaths of three soldiers on training march | Daily Mail Online
![A serious challenge, trig 642 is, despite its modest height, quite possibly one of the most demanding trig pillars to bag, if you stay true to the way it would be reached A serious challenge, trig 642 is, despite its modest height, quite possibly one of the most demanding trig pillars to bag, if you stay true to the way it would be reached](https://getoutside.ordnancesurvey.co.uk/site/uploads/images/assets/Thumbnails/new%20adventure%20thumbs/Brecon%20Beacons.png)