The five-star rank still exists, although no U.S. officers have held it since the death of General Bradley in 1981. The president may promote a general or admiral to five-star rank at any time, with Senate approval. However, U.S. military policy has been to award five-star rank only when the rank of an American commander must be equal to or higher than that of officers from other nations under his or her control (as was the case in World War II).
Maybe he meant to say 3 and 4-star.