A recent test flight of the Lockheed Martin HAWC air-breathing hypersonic missile set a record for scramjet propulsion at hypersonic speeds, achieving about 327 seconds of combustion, versus 200 seconds in a 2010 test of the Boeing X-51 Waverider.
Intelligence, surveillance, and reconnaissance aircraft are among the Air Force's most-requested assets worldwide, but the service wants to cut back the number of combat air patrols it supports with ISR on any given day so it can free up funds in the fiscal 2022 budget ...