有区别。 Four Star General Only officers who show great leadership and loyalty become four-star generals. Three Star General An officer in the Army, Air Force, or Marines who is above the rank of Major is a Three Star General. Major General Commands a division which is 10,000 to 15,000 soldiers. Brigadier General Commands a brigade within a division. Colonel Usually commands a regiment within a division. Lieutenant Colonel Usually 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. Captain A captain usually commands a company with a battalion. First Lieutenant May command platoons or companies. Second Lieutenant Lowest ranking commissioned officer. Sergeant Major of the Army Highest rank for a soldier. Command Sergeant Carries out standards, performances, training, and conduct to soldiers. Sergeant Major The key enlisted member of a battalion. Master Sergeant The lead non-commissioned officer at the battalion and sometimes higher levels. Sergeant First Class Most candidates have at least 15 years experience. Referred to as Senior NCO’s or Non-Commissioned Officers. Staff Sergeant Has more time and experience in the Army than the Sergeant. Sergeant Non Commissioned Officer above a Corporal. Corporal Lowest non-commissioned officer, often commands a squad. Private First Class Grade above private. Private lowest rank of enlisted men. 参考资料: http://www.promotega.org/fld00019/rankings.htm