Sometime in the 50s, one, inbound from the States, lost an engine and (rumour has it) SAC required total abandonment for such condition!
Sorry, not true, if it was, not a single B-36 would have survived.
On very long range missions it was not uncommon to lose two engines and still carry on.
Curtis LeMay was very protective of
his B-36s. Any aircraft commander that crashed a B-36 usually lost a grade in rank and faced possible court martial unless it was proved that the loss was totally beyond their control.