The good ol' Blackwater/XE Services/Academi gambit.
How's Accenture doing these days? (Not quite the same I know, but I did just discover today that Arthur Andersen relaunched last year, huh!).
In a fit of irony, multiple partners left the smoking ruins of AA to found a firm called, of all things, Accuracy.
How far back does the practice of renaming something after an infamous debacle go? If it's smoking ruins you want, then i can recommend Windscale, which was renamed to Sellafield not long after this little bit of excitement in 1957: