less formal evening occasions. The short mess jacket was either dark blue or white, according to climate. After 1911 the blue jacket included lapels in branch color (yellow for cavalry, red for artillery, light blue for infantry, and so on). The individual officer could wear full dress or either of the evening dress alternatives for social functions. In view of the expense involved, it was usually senior officers who appeared in mess or evening dress uniforms. While the blue full dress was worn from 1902 to 1917 by all ranks for ceremonial parades within the continental United States, the two optional evening uniforms were authorized only for officers. The various blue uniforms ceased to be worn after 1917. However, the white mess uniform for commissioned and warrant officers was authorized again in 1921. In 1928, wearing of the full range of blue dress uniforms was authorized for all ranks, but only when off duty, and at the expense of the individual. In practice, this meant that only the pre-1917 mess uniform, and to a lesser extent the special evening wear, reappeared in significant numbers. After World War II, the evening dress and mess dress uniforms were reintroduced, with the tail coat having a single Austrian knot (trefoil) over the branch-of-service color (general officers had stars over an oak leaf braid), with the rank placed in the bottom opening of the knot. The mess jacket, intended for black-tie occasions, used an Austrian knot rank system with the branch insignia at the bottom. The number of knots indicated the officer's rank: five for colonel, four for lieutenant colonel, three for major, two for captain, one for first lieutenant, and none for second lieutenant. This complicated system, which required that the braid be altered with a change of rank, was replaced with the evening coat style in 1972, using a single knot and the rank placed above the branch-of-service color. A white mess jacket for summertime wear was introduced in the 1950s. The "special evening dress" (tails) was finally abolished in 1969, although officers already in possession of this uniform could continue to wear it until 1975. It was replaced by the Army blue mess uniform, which in its modern form closely resembles that of 1911. It is common for soldiers to wear suspenders in their branch color with the army dress uniform trousers, although they are concealed under the coat. Miniature medals