Uniform of the Union Army letters US. Officers, NCOs and cavalry troopers were equipped with a sword belt with a rectangular buckle with eagle motif. Rank was displayed on epaulettes (dress occasions) or shoulder straps(field duties): no insignia for a second lieutenant, one gold bar for a first lieutenant, two gold bars for a captain, a gold oak leaf for a major, a silver oak leaf for a lieutenant colonel, a silver eagle for a colonel and one, two or three silver stars for a general, depending on his seniority. The color of the shoulder strap fields – with trims in gold braid – were
United States Army officer rank insignia gold was a consequence of the decision in 1851 to select silver over gold as a matter of economy. While not currently in use today, special insignia were authorized by Congress for ten general officers who were promoted to the highest ranks in the United States Army: general of the army, designed as a "five-star" rank, and general of the armies, considered to be the equivalent of a "six-star" rank. Eight generals were promoted to the rank and title General of the Army (Ulysses S. Grant, William Tecumseh Sherman, Philip Sheridan, George Marshall, Douglas MacArthur, Dwight D. Eisenhower, Henry H.