Current SAS issue is the commercialy available Penrith kit. There are two knives issued for "survival', the Mod 4 and an aircrew emergency knife. You may see both @ www.shopping-emporium.co.uk ( key on survival knives). I have a Mod 4. It is a brute! It is mainly for smashing out of downed aircraft and as a small machete/bowie. There are two versions;Military has wood handles,commercial a composite material. They are very uncomfortable. Special Units often discard any identifying national gear and rely on native or hostile materials and equipment.