When I was a student intern with the US Attorney's Office I was given a confidential clearance and it was a minimal back ground check. Finger prints, and criminal history was about all that was checked. However, I did fill out the entire SF-86. It still only took about 5 weeks for mine to process. That is a lot faster than most officer/agent background checks. However, that might be different than what you are asking about.
As a nation we adhere to the maxim: "The object is not to die for one's country, it's to make the other poor son of a [gun] die for his." - Gen. Patton