![](https://www.historynet.com/wp-content/uploads/2017/11/Mother-X-15-960_640.jpg)
B-52A no. 52-003 carries a North American X-15 rocket plane to launch altitude over
Edwards Air Force Base. (Dean Conger/Getty Images)
B-52A no. 52-003 carries a North American X-15 rocket plane to launch altitude over
Edwards Air Force Base. (Dean Conger/Getty Images)