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51st Expeditionary Signal Battalion Soldiers deployed to Arizona for communications exercise operation “Desert Hawk” at Davis-Monthan Air Force Base and Bisbee-Douglas airport about 120 miles to the southeast to train on their Tropospheric Scatter systems. Troposcatter communications transmits and receives microwave signals at beyond-line-of-sight distances as far as 200 miles without satellites by bouncing radio signals off layers of the Earth's atmosphere. The Soldiers primarily from the unit's C Company are practicing their skills while in a field environment until Dec. 14. The 51st provides expeditionary signal support to the 593rd Sustainment Command (Expeditionary).