Air Force Airman 1st Class Mohamed Cassim, a 28th Civil Engineer Squadron CES heating, ventilation and air conditioning journeyman, wraps a heating vent on a duct at Ellsworth Air Force Base, , Jan. 26, 2011. The Air Force saved more than $75,000 by having the Airmen from the 28th CES install the new HVAC system rather than contractors. Senior Airman Anthony Sanchelli

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Keywords: .., 28th, afb, air, ces, civil, dakota, defense, ellsworth, engineer, force, hvac, military, south, united, usa, war