Why did Georges Clemenceau want the Rhineland for fifteen years?

He didn't want the Rhinelands for 15 Years, he wanted it entirely for revenge against the Germans. It was apart of the agreement set by the 3 Allies; GB, USA & FRA. Also, the Rhineland was not France's for 15 Years, it was still German but it was demilitarised for 15 years and occupied by allied troops.