有区别。

Four Star GeneralOnly officers who show great leadership and loyalty become four-star generals. Three Star GeneralAn officer in the Army, Air Force, or Marines who is above the rank of Major is a Three Star General. Major GeneralCommands a division which is 10,000 to 15,000 soldiers. Brigadier GeneralCommands a brigade within a division. ColonelUsually commands a regiment within a division. Lieutenant ColonelUsually commands a battalion made up of 300 to 1,000 soldiers. A battalion is within a regiment. Major Serves as a staff officer to a regiment or division commander. CaptainA captain usually commands a company with a battalion. First LieutenantMay command platoons or companies. Second LieutenantLowest ranking commissioned officer. Sergeant Major of the ArmyHighest rank for a soldier. Command SergeantCarries out standards, performances, training, and conduct to soldiers. Sergeant MajorThe key enlisted member of a battalion. Master SergeantThe lead non-commissioned officer at the battalion and sometimes higher levels. Sergeant First ClassMost candidates have at least 15 years experience. Referred to as Senior NCO’s or Non-Commissioned Officers. Staff SergeantHas more time and experience in the Army than the Sergeant. SergeantNon Commissioned Officer above a Corporal. CorporalLowest non-commissioned officer, often commands a squad. Private First ClassGrade above private. Privatelowest rank of enlisted men.。