I remember reading a story many years ago that said that it was not uncommon for SR71 missions to detour over Hanoi and, resoundingly B:surprised::surprised:M the daylights of the city.
In particular a three flight sortie going over the city at Mach "Oh my God PLUS" to let our captured Airman/Soldiers in the Hanoi Hilton know we still cared and, too hold on....