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 F-16/101 assisted in the development of the F110 turbofan, for which the F101 would serve as the core, and the F110 would become an alternate engine for both the F-16 and F-14. The Vought/General Dynamics Model 1600 was a navalized derivative of the General Dynamics F-16 Fighting Falcon designed for the United States Navy's Navy Air Combat Fighter (NACF) program. The Model 1600 lost to the Northrop/McDonnell Douglas F/A-18 Hornet. For the "F-X2 fighter programme" for the Brazilian Air Force, Lockheed Martin offered the "F-16BR Super Viper". The F-16BR is based on the F-16E/F Block 60 and features conformal fuel