Term time, 3 or 4 years?

[leonpoi]

Another questions that I would like to slip in instead of making another post - should the requirements (tw2k v2.2) for SF-type characters include a term in the military?

Could anyone shed some light on the following real life entry requirements:
USA Rangers
USA Special forces
USMC Force recon
USMC Sniper
USN SEAL

I know that UK SAS requires a "term" in the army, for e.g.

What would the requirement be? Would it be a term in the military or specifically a term in the infantry?

thanks