Congratulations. You got one of a small number of contracts that are apparently evaporating. Your Point of Contact will give you a list of stuff to get done. Your "qualify with the FBI" thing is either a background check (which you probably already did) or your security clearance. Your point of contact will give you a Standard Form 86 to fill out. It'll take you a hell of a long time and it'll ask you for lots of obscure information. No biggy if you don't have a sordid past.