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51st Communications Squadron Airmen examine and operate a Very Small Aperture Antenna (VSAT) during a resiliency exercise Osan Air Base, Republic of Korea, Oct. 6, 2021. The resiliency exercise, referred to as COMMREX 21-3, consisted of Airmen testing stationary and deployable communications capabilities. The VSAT is a small-sized earth station used in the transmit and receive of data, voice and video signals over a satellite communication network, excluding broadcast television.