A sinkhole, a depression in the ground caused by the collapse of the surface layer, causes a partial collapse on Taxiway Echo at Joint Base Andrews, Md., June 15, 2021. In July of 2021, heavy rainfall in the National Capital Region resulted in a significant sinkhole. This required the 316th Civil Engineer Squadron to swiftly perform an emergency response to restore the taxiway to fully mission capable on a sensitive military installation responsible for presidential-level operations.