Originally posted by Aramis:
The anagathics addiction also helps.
Like the Jem Hadar; addicted to a substance they can get only one place.
::: Ramble Alert! :::
IMTU, there is a fine line between military and para-military special forces. Much like today, the military units are made up of hand picked candidates who survive initial training. The paramilitary groups normally consist of military veterans and mercenaries who have earned a certain amount of legitimacy. Corporations often hire their solos from the stable of ex-military and para-military operatives looking for calmer seas.
All in all, the numbers and overall capability dwindles the further away from the military units you get.
WRT numbers; no non-military organization can maintain force strength in the tens of thousands (Empire wide). The largest para-military organizations have only battalion sized combat teams. Merc and Corp units above battalion strength are very rare.
The military training is superb and civilian units just don't have the same levels of readiness or discipline (especially among the mercenary ranks). As far as material capability, the military does lag behind the para's and corporates but they, in turn, have access to military weapons banned from civilian use (i.e. artillery, ortillery, nukes, etc.). New equipment is normally tested by the para's before deployment to the military units. The corp's have specialized equipment and one-offs only dreamed of by the military (think 007).
As for specifics, IMTU, the IM and IN have organized special forces segregated by operating environment and type of warfare. There are your typical pathfinder, demolition, psychological, sniper, surveillance, and combat SAR units, all trained specifically for the environments they are expected to operate in; they are extremely specialized. The IA has similar units, but due to the IA's supporting role (IMTU), these units are generally not as capable as front line Marine units; if only due to the IM's greater combat experience.
There are any number of para-military groups; nearly every sub-sector intel organization has several groups under their direct supervision. Often times they operate blind to each others movements. The majority are involved in law enforcement of some kind or another; others have more sinister mission areas. IMTU, large independent mercenary units are illegal, creating a glut of capable operators for the spooks to hire cheap.
The corporate types are much fewer and far between. Mega-corps do maintain extensive security forces but seldom are they capable combat units, being mostly rent-a-cops and retired law enforcement. That doesn't mean the shirts don't have a few capable assassins or spies in their stables, but their corporate security typically couldn't hold off an assault by even a green military unit for very long. Why bother when slipping a Duke, Admiral, or Don a few million creds gets them all the real protection they will ever need?