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
Lockheed Martin F-35 Lightning II procurement potentially hostile Russian airspace in the event of a nuclear escalation is considered weaker than that of the F-35. Lockheed Martin offered the F-35 to Greece's Hellenic Air Force as a replacement for F-4E Peace Icarus 2000 and F-16C/D Block 30 aircraft in 2009. As of October 2017, largely due to the Greek government-debt crisis, Greece has decided to upgrade the Hellenic Air Force's fleet of ageing General Dynamics F-16 Fighting Falcon aircraft, and to postpone a decision on further procurement until the 2020s. The F-35 was reportedly still on the table, and if economically viable by the 2020 timeframe,