Many units after Normandy suffered over 100% casualties. That is based upon the total number of dead, wounded, missing, and invalids as compared to the original component of the unit. As casualties occurred, they were replaced by green troops from the States. My dad's outfit suffered 125% casualties overall, although in his particular unit, about 75% survived the war. The sad truth is that casualties were very high in the replacements and much lower in the veterans remaining in those units. There was a formula that if you served a certain number of weeks without becoming a statistic, you would more than likely survive the war.