An interim clearance allows a person to have access to collateral classified information (at the level requested without a caveat) while his or her final clearance is being processed. For example, a person with an Interim Secret may have access to a document marked Secret, but not a caveated one, Secret COMSEC..
Enlisted Air Force ranks are broken down into three levels: Airmen (E-1 through E-4), Non-Commissioned Officers (E-5 and E-6), and Senior Non-Commissioned Officers (E-7 through E-9). The Air Force is the only one of the five branches of the U.S. military where NCO status is achieved at the grade of E-5.
In 1958 the Army added two grades to the NCO ranks. With the addition of these grades, the ranks of the NCO were corporal, sergeant, staff sergeant, sergeant first class, master sergeant and sergeant major.