Alot of times, when they use Shado callsign (it's usually Shado 22), they are on a non-TACAMO mission. Either coming into PAX from their home base at Tinker AFB OK or going back to Tinker after their TDY to PAX. Sometimes I think the Shado flts are for maintenance checks or crew proficiency. The one you saw could've been heading back home to Tinker.
VMGR-452 is transitioning to J models. Some of their other planes have already gone to AMARG or the Navy.Was at ADW this afternoon. A USMC KC-130T departed at Navy Alpha X-Ray 315 and returned immediately as an IFE. Odd that its using a VR-53 Callsign. Not even sure when it arrived at IAD.