Didn't in one of the novels or sourcebooks, Celestial Wisdom dispatched a single Commando to a world that was in rebellion, and shortly thereafter all resistance ceased?
They sent 1 Death Commando to Northwind to try to get the Highlanders to come back to the CC, or atleast remain neutral. It was a mixed success. The Highlanders fought a kind of civil war, and then ended up independent, but the Death Commando (who was a Highlander by birth) defected.
I dunno if that's what you ment, but It's the only Lone Commando deployment that comes to mind.