The U.S. Air Force has awarded 13 companies positions on a potential $15 billion firm-fixed-price, multiple award contract to provide construction services for the Air Force Civil Engineering Center . Air Force Civil Engineering Center Contract DetailsThe Department of Defense said Monday the indefinite-delivery/indefinite-quantity contract covers a wide range of design-build and design-bid-build construction services. These services include sustainment, maintenance and repair, restoration, modernization, minor construction, military construction, other procurement construction and demolition. The construction work will be performed at various sites worldwide. If all options are exercised, the contract is expected to be completed on Sept. 29, 2035.