On pages 20-21 of the fourth printing of Campaign Operations, combat personnel are permitted to double as astechs or even full technicians if they have the appropriate amount of Technician skill. If you aren't tracking that, up to a quarter are assumed to have it.
With administrators, you're stuck with the one-quarter cap. Administration is a skill in A Time of War, and it's included with officer training: why can't you use that skill in place of the cap like you can with technical double-duty?
