The MOS (military occupational specialty) will be indicated, along with other special indicators, such as being parachute qualified.If the person has been to jump school, they have at least a secret clearance.Many are obvious:If the MOS begins with 18 XXXX. They were Special Forces. They would have had a top secret clearance.25 XXXX signals = TS14 XXXX Air defense = TS11 B XXX Infantry, could have no clearance beyond confidential11 F XXX also Infantry but the F denotes Infantry Operations and intelligence = TSLook up the MOS, and the clearance will probably be obvious.All commissioned and warrant officers have to have a TS clearance.All clearances, no matter how high, require a need to know.