the latter two used to augment artillery and support battalions in the remaining three BCTs. The 1st Squadron, 9th Cavalry joined the 2d Brigade Combat Team, the 2d Battalion, 7th Cavalry joined the 3d Brigade Combat Team and the 2d Battalion, 12th Cavalry joined the 1st Brigade Combat Team. The 3d Cavalry Regiment was subordinate to the division until March 2017. Shoulder sleeve insignia The shoulder sleeve insignia was originally approved 3 January 1921, with several variations in colors of the bend and horse's head to reflect the subordinate elements of the division. The design was authorized for wear by all subordinate elements of the division on 11 December 1934, and previous authorization for the variations was canceled. The insignia is worn subdued on field uniforms after experience in the Vietnam War, where the gold was too conspicuous. Normally, the gold is changed to the base color of the uniform to subdue it. With the retirement of the green "Class A" uniform in October 2015, only the subdued version of the SSI is worn, on the ACU's left sleeve. It consists on a yellow, triangular Norman shield with rounded corners in height overall, a black diagonal stripe extends over the shield from upper left to lower right, and in the upper right a black horse's head cuts off diagonally at the neck, all within a 0.125-in green border. Yellow was chosen because it is the traditional cavalry color, and the horse's head refer to the division's original cavalry structure. Black, symbolic of iron, alludes to the transition to tanks and armor. The black diagonal stripe represents a sword baldric and is a mark of military honor; it also implies movement "up the field" and thus symbolizes aggressive elan and attack. The one diagonal bend and the one horse's head also allude to the division's numerical designation. Distinctive unit insignia Description: A metal and enameled device, 1 inch in height overall, consisting of a gold-colored Norman shield with a black horse's head couped in sinister chief, and a black bend charged with two five-pointed stars. Properly: Or, on a bend sable two stars of five points Or, in chief sinister a sable couped horse head, a border vert Symbolism: The device is a miniature reproduction of the 1st Cavalry Division's shoulder sleeve insignia with the addition of two five-pointed stars. The Division Commander and the Division Staff wore the distinctive insignia