 Lockheed Martin suggested rebuilding old F-16A fighters as UAVs, fitting them with a wide wing to provide additional fuel, and also permit carriage of six or more air-to-surface weapons to provide the air-occupation strike element.The modified F-16As would have had endurance of 8 hours over a target area, and three sets of them could maintain 24-hour coverage.The United States Navy also began studies for UCAVs at about the same time.