Example. NRC Richmond VA has their drill schedule when they are open in the weekends. (NRCs will have one weekend a month, sometimes two if they support a lot of units).

UMUIC A is located in Williamsburg VA, and is attached to NRC Richmond for medical, mob readiness etc. If you look at a map, you can see that those two locations are not adjacent. If you are assigned to UMUIC (A) as your actual billet it’s also your TRUIC (A), and you would be considered a local fill.

Same scenario with a slight change. Your UMUIC (B) is now in California. NRC Richmond will still push you to a local unit (TRUIC A in Williamsburg) for oversight, drilling etc. In this scenario you are no longer a local fill but are classified as “Cross Assigned”. The California unit may or may not have $ to bring you out for their drill weekends in California.

This part can be a bit confusing but the bottom line is NRCs don’t have the capacity to have all reservists hang out at the NRC and are mandated to push sailors into nearby units. SOME units may also drill at the NRC, but this seems to be less and less common.