This became operational as USAF S/N 74-1519 and later transferred to the Navy and became BuNo 741519. The aircraft was then modified by Northrup/Grumman, under a DARPA contract, for NASA Shaped Sonic Boom Demonstration (SSBD).   She was acquired by the Valiant Air Command Warbird Museum in Titusville, FL from the Northrup/Grumman facility in St. Augustine, FL after completion of the project.