The Galactic Empire: An Empire Reborn
Imperial Officers' Manual
Major Revision: 2.0 – 2008.10.31
An adaptation of the pre–Endor document and policies.

A Sector Group Flag Officer (SG-FO) commands a sector group from his stationing onboard its flagship...

A sector group is typically composed of an ISD flagship and no less than three systems forces... In theory, such a force maintains control over an entire sector of GE-controlled space. In practice, the range of a single sector group spans multiple sectors, in compensation for the diminished numbers of capital ships available to the modern war-torn Empire.

Needless to say, there will be very few of these positions available, with their subordinate forces reaching a size near to the largest that any single officers will have beneath their jurisdiction...