In the 1950s, the epoch-making U-2 spyplane was young, promising, and still very, very secret.
Air Force Global Strike Command test-launched an unarmed Minuteman III intercontinental ballistic missile Aug. 16, several days after delaying the test to avoid stoking tensions with China. The launch from Vandenberg Space Force Base, Calif., took place at 12:49 a.m. Pacific time. The ICBM reentry vehicle traveled approximately 4,200 miles…