Staff Officers wear the same sleeve rank stripes as those worn by the Line Officers of the same rank but they do not wear the gold star. The Corps to which Staff Officers belong is indicated by bands of colored cloth around the sleeves filling the intervals between the gold rank stripes, the colors and material of the stripes for the different corps being as follows: Medical Officers—dark maroon velvet. Pay Officers—white cloth. Professors of Mathematics—olive green cloth. Naval Constructors—dark violet cloth. Civil Engineers—light blue velvet. Medical Reserve Officers—crimson cloth. Dental Officers—orange colored velvet. When but one stripe is worn, that is for officers of the rank of ensign, the colored cloth is made to show one-quarter of an inch on each side of the stripe. For Staff Officers of the Naval Militia the colored corps stripes are broken for a distance of one and one-quarter inches at the center of the front of the sleeve. The rank and corps of officers is shown on the blue service coat in two ways: first, by the stripes on the sleeves as above described; second, by rank and corps insignia worn on each side of the standing collar, to the right and left of the front opening at the neck. These collar insignia are as illustrated, and consist of the insignia of rank in combination with the device indicating the corps of the wearer. The Corps device or insignia, indicating to what corps or branch of the service the officer belongs, are: _Line Officers_: a silver foul anchor, one and five-eighths inches long over all, one inch wide from tip to tip. _Medical Corps Officers_: a silver acorn embroidered upon a gold spread oak leaf, stem to tip one and three-quarters inches, width one inch. _Pay Corps Officers_: a silver oak sprig of three leaves and three acorns, one and three-quarters inches long by one inch wide. _Professors of Mathematics_: a silver oak leaf and an acorn, one and three-quarters inches long and one inch wide. _Naval Constructors Corps_: a gold sprig of two live-oak leaves and an acorn, one and five-eighths inches long and one and three-eighths inches wide. _Civil Engineers Corps_: two crossed silver sprigs, each of two live-oak leaves and an acorn, one and three-quarter inches long and one inch wide. _Chaplains_: a Latin cross embroidered in silver. _Medical Reserve Corps_: a gold acorn embroidered upon a silver spread oak leaf, one and three-quarters inches long and one inch wide. _Dental Corps_: a gold spread oak leaf with a silver acorn on either side of the stem, one and three-quarter inches long and one inch wide. The rank insignia, indicating the rank of the wearer, are practically the same as those for the Army and the Marine Corps, and are as follows: