[quote=@VeyrinDay]
btw, how long does it usually take for one without military background to get qualified as a special force operator and assigned for missions in such nature? Maybe also what's the youngest age ever had such degree of qualification?

yea, I'm asking about the non-classified ones, of course :D
[/quote]

I can only speak for the US Army. In order to enter the Special Forces, you must already be at the rank of Sergeant (E5). Depending on your Military Occupational Specialty (MOS), this could be anywhere from 3-6 years. Once you are an E5, you attend the Special Forces Qualification Course (SFQ) at the John F. Kennedy Special Warfare Center (JFK-SWC) at Ft. Bragg, NC. Depending on which MOS you choose, your training will take 56 - 95 weeks before you are qualified in SF. [url=https://en.wikipedia.org/wiki/United_States_Army_Special_Forces_selection_and_training]Take a read of this.[/url]

If you wanted to go through Ranger School, you can enlist as an 11B Infantryman at Ft. Benning, GA. 11B course is 14 Weeks long. Once you graduate from Basic Combat Training and Infantry School, you then go to Airborne School. For enlisted soldiers this is 4 weeks (0 Week, Ground Week, Tower Week and Jump Week). Once you qualify as a parachutist, you would then attend Ranger school which is roughly 9 weeks long. There are four phases; Camp Darby, Dahlonega, GA (Mountain); Ft. Bliss or Ft. Hood, TX (Desert) and Eglin AFB, FL (Jungle). Graduate from Ranger and get sent to one of the three Ranger Battalions. From the time you enter the Army to the time you are qualified as an Airborne Ranger is about 30 weeks if you add in the time spent waiting around for training to begin.

Rangers are the masters of patrolling
SF serves two missions: Direct action (combat raids and surveillance) and training Host nation troops or rebel troops of a nation the US has good relations with or poor relations with.