Federal Job Preference:

If Federal Job GS, GM, SES, Officer, Enlisted, Warrant Off:

Give the Federal Job Prefix that pertains to your status while 
using last, this KSA.  (Only applicable if you were a Federal
Employee in the Past).

       GS = General Schedule,
       GM = General Management
       SE = Senior Executive Service
       O  = Officer in one of the Armed Forces
       E  = Enlisted man
       W  = Warrant Officer