The winged, upright, and unsheathed sword in the center of the 13th Aviation Regiment Distinctive Unit Insignia (also called a unit crest or simply DUI) is a reference to the combat aviation mission of the organization at the time the insignia was originally approved (November 1967). A red and yellow equilateral triangle is a reference to the Mekong River Delta where the unit served in Vietnam. The colors red, yellow, and blue stand for three basic combat branches involved in airmobile warfare: Infantry, Artillery, and the Cavalry that transported them to battle zones; the winged sword (1) and 3 colors also allude to the numerical designation of the unit.
The DUI is the picture is the one you will receive.