Lockheed Martin SR-72 have the same range, with entry into service by 2030. The SR-72 follows the US Air Force's hypersonic road map for developing a hypersonic strike weapon by 2020, and a penetrating ISR aircraft by 2030. At the time of the concept's unveiling, Lockheed Martin had engaged in talks with government officials, but has not secured funding for the demonstrator or engine. On 13 November 2013, Air Force Chief of Staff General Mark Welsh revealed that the service was interested in the SR-72's hypersonic capabilities, but had not spoken with Lockheed Martin about the aircraft. Its high speed appeals to the
General Dynamics F-16 Fighting Falcon variants reported that the US Air Force had decided to upgrade the F-16, F-22 and F-35 (all Lockheed Martin-designed, fly-by-wire fighters) with the AGCAS system. The F-16 Agile Falcon was a variant proposed by General Dynamics in 1984 that featured a 25% larger wing, upgraded engine, and some already planned MSIP IV improvements for the basic F-16. Unsuccessfully offered as a low-cost alternative for the Advanced Tactical Fighter (ATF) competition, some of its capabilities were incorporated into the F-16C/D Block 40, and the Agile Falcon would serve as the basis for developing Japan's F-2 fighter. The F-16 Enhanced Strategic (ES) was