In many sci-fi stories such as Star Wars (before TFA invalidated it) featured emperors, leaders, and senators with personal bodyguards trained in martial arts and advanced weaponry that also doubled as special forces. For example, the Fel emperors in the linked wiki would often send their Imperial Knights on daring missions. In more canon material, the Knights of Ren seem to serve the same (albeit in a darker manner) purpose in TFA. Is there a real-world precedence for this or did hollywood/writers make this up?
Perhaps I was not clear. By special forces I mean crack soldiers often deployed to take high-value targets/complete various missions behind enemy lines.