Can a security clearance be reinstated after it has been terminated

Yes. If a person previously had a clearance and the investigation has not gone out-of-date, the clearance can be reinstated by the agency that originally granted the clearance or it can be accepted and reciprocally granted by a different agency, provided there hasn’t been a break-in-service of two years or more. This can be done without the individual submitting a new SF86; however, for clearances involving special access authorizations a new SF86 can be required if there has been a break-in-access of more than 60 days or if a polygraph examination is required. Under certain circumstances a clearance can be reinstated (recertified), if it is not more than 2 years out-of-date and a request for reinvestigation has been initiated.