The Office of Personnel Management has no procedure for an individual to independently apply for an investigation, positions maintained by contractor, or security clearance. Clearances are based on investigations requested by Federal agencies, appropriate to specific positions and their duties. Until a person is offered such a position, the government will not request or pay for an investigation for a clearance. Once a person has been offered a job (contingent upon satisfactory completion of an investigation), the government will require the person to complete a Standard Form 86, Questionnaire for National Security Positions, initiate the investigation, adjudicate the results, and issue the appropriate clearance.
We know that some Defense Department contractors require applicants to already have a clearance, and they have the right to administer their personnel hiring procedures the way they want as long as they don't discriminate based on prohibited factors (such as race or religion). Persons who already have clearances are those who are already employed by a government contractor (or by the government itself) and are looking for other job opportunities.
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