I would love to have seen a Vulcan going full noise (max throttle) through the Mach Loop. That would've been awesome.The Valiant was the technologically & aerodynamically conservative, low risk, option, able to be delivered earlier than the more advanced Victor or Vulcan.
It also turned out to be the shortest-lived, developing major fatigue problems very soon after being switched to low-level flying which led to inspection of the entire fleet & the discovery of greater than expected fatigue across the fleet, & was retired early.