上士
The rank of staff sergeant in the U.S. Army, along with technical sergeant (renamed sergeant first class in 1948) and master sergeant, was created by Congress after the First World War. In 1920 the Army combined several company/battery/troop level "staff" NCO ranks, including color sergeant, supply sergeant, radio sergeant, eleven grades of sergeant first class, three grades of sergeant, two grades of master gunner, and assistant band leader into the new rank of staff sergeant. Staff sergeant, as did the ranks it combined/replaced, then ranked above sergeant but below technical sergeant/first sergeant (which, at the time, were both in the same pay grade). At that time, sergeants served as section leaders, platoon guides, and assistants to platoon commanders (the position of platoon sergeant, nor a separate rank for the position, did not yet exist), and included several formerly separate ranks such as mess sergeant, company supply sergeant, and stable sergeant, etc. In 1940, staff sergeant became the rank title of rifle platoon sergeants and in 1942 rifle squad leaders became staff sergeants, with platoon sergeants then being promoted to technical sergeants. (Perrenot, 2009)