Airman 1st Class Zach Mitchell, 28th Civil Engineer Squadron structures technician, measures the length of a board while building a deck at the Pine Tree Inn on Ellsworth Air Force Base, S.D., April 24, 2012. Many updates and periodic maintenance are occuring on Ellsworth in preparation for upcoming 70th Anniversary Celebrations. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)