How do you get security clearance?

after youre final appeals etc are done and the dust is settled you have a period of 12 months from your appeal deniel letter before you can RE-APPLY for your clearence

Secret clearances are done every 10 years and Top Secret are done every 5 years for USAF personnel. Nearly everyone in the USAF has a Secret clearance.

depends on circumstances

Without breaking government encryption and protocols you must be in a top position in the government like sec nav, or be in the NSA. Get elected presidentBe someone the International Community would...

This question is absolutely impossible to answer. There are millions (if not billions) of people who have some sort of security clearance.