It’s part of an upgrade to keep the aging B-52 fleet modern and flying through ... Similarly painted B-52s also served as the mother ship for the X-15 hypersonic research project in the 1950s ...

The U.S. Air Force is thinking about replacing the late-1950s- era engines on its Boeing B-52 bombers with modern ones. It should have done that a decade ago, but back then, the Air Force believed ...