Army - Us Army - Sergeant First Class Classic T ShirtSolid colored t shirts are 100% combed ringspun cotton, however, heathered colors could contain a cotton polyester blend Preshrunk to minimize shrinkage Double needle sleeve and bottom hems United States Army Sergeant First Class ( SFC ) is the seventh enlisted rank (E 7) in the U. S. Army, ranking above staff sergeant (E 6) and below master sergeant and first sergeant (E 8), and is the first non commissioned officer rank designated as a senior non