Naval Air Station Cecil Field or NAS Cecil Field was a United States Navy air base, located in Duval County, Florida. Prior to 1999, NAS Cecil Field was the largest military base in terms of acreage in the Jacksonville, Florida area. As directed by the Base Realignment and Closure Commission (BRAC) and the U.S. Congress pursuant to BRAC 1993 and BRAC 1995, NAS Cecil Field was decommissioned as an active naval installation on 30 September 1999. It is now a civilian, public-use, joint civil-military airfield and industrial park known as Cecil Commerce Center and Cecil Airport.