Joint-service exercise, SENTRY REX 20-3, was back for its third iteration and was more robust than ever. Units and assets involved in the exercise included E-3 Sentry Airborne Warning and Control System aircraft from Tinker Air Force Base, Joint Surveillance and Target Attack Radar System aircraft from Robins AFB, MQ-9 Reapers operated from Ellington Field Joint Reserve Base, MC-12s from the 137th Special Operations Wing, CV-22 Osprey and AC-130 Gunships from Cannon AFB, an MC-130H Combat Talon IIs from Hurlburt AFB and KC-135R Stratotankers from the 314th Air Refueling Squadron at Beale AFB.