sentences:  The total number of active-duty four-star generals in the Army is limited to a fixed percentage of the number of Army general officers serving at all ranks.Within the Army, the chief of staff (CSA) and vice chief of staff (VCSA) are four-star generals by statute.Since World War II, the commanders of the Army formations in Europe (USAREUR) and East Asia (FECOM/USFK) have been designated four-star generals by reason of importance.