South Effricans of course,
The South African Police Service Special Task Force (SAPS STF) is the special operations element of the South African Police Service (SAPS).The STF is considered to be among the best of such units in the world[citation needed]. The STF has a formidable reputation in counter terrorism and insurgency and hostage rescue. Unlike most civilian/police counter terrorist units around the world, the special task force is also trained to conduct military special operations and has done so on many occasions, operating with their military counter parts, especially during the long 30 year border war. Indeed they are internationally regarded as deadly exponents in the art of bush warfare. A fact worth mentioning is that during the 70's and 80's, during the border war, many British SAS volunteered for selection, most passed and consequently served in the South African Special forces.
Check out their hell week,
http://www.youtube.com/watch?v=Z4yHFw1GM1A&feature=related
Reminds me of BUD's without all the swimming.