ELLSWORTH AIR FORCE BASE, S.D., Contractors pour concrete at Ellsworth's propane air mix plant Sept. 29 in preparation for the installation of four new tanks, each capable of holding 60,000 gallons of propane. The plant, completed in December 1998, was part of the first contract partnership between Ellsworth and Montana Dakota Utilities (a subsidiary of Montana Dakota Resources Inc.) and still saves Ellsworth more than $1 million annually. Contracts like these are part of why the 28th Civil Engineer Squadron Energy Management Team was recognized in the small-group category Oct. 5 during the 2006 Federal Energy and Water Management Awards ceremony in Washington. (U.S. Air Force photo/Airman 1st Class Kimberly Limrick)