I read a news story about a year ago regarding the F16's, they are stationed at various locations around the country, that sector is covered by F 16's based at Ellington Field at Houston. They actually have a readiness facility located at the end of the runway so they can be airborne in a couple of minutes. The A/C and crews are rotated every few days from various ANG units in their sector. Our local ANG participates in the rotation schedule.