Tech. Sgt. Mark Yurkiewicz, Air Force Engineering and Installation Team installer, deployed from Pennsylvania Air National Guard's 270 EIS, uses an excavator fill a conduit trench at Erbil Air Base, Iraq, February 23, 2019. Members of Air Force E & I install and engineer new communications systems for a specific mission's requirements, as well as remove and relocate old or outdated systems. (U.S. Air Force Photo/Tech. Sgt. Robert Cloys)