These are officers at the apex of field operations.
: Oversees general administrative and policy matters. seniority+list+of+irs+officers+fbr
Officers in these grades are monitored for promotion zones. For example, the FBR often issues notices to officers from specific seniority numbers (e.g., Seniority No. 1 to 52 ) to complete their Performance Evaluation Reports (PERs) for upcoming promotion boards. These are officers at the apex of field operations