 Despite their use of the diamond patches, there is no historical connection between the use of the insignia in World War II and the 101st Aviation Brigade.The brigade links their current use with the use of color-coded diamonds on UH-1s by the unit during Vietnam, when it carried the designation of 101st Aviation Battalion.Although helmet markings are commonly worn by units throughout the Army, The Institute of Heraldry has confirmed they are not authorized by the Army's uniform regulations.