Civilian Technical Representatives supporting military activities wore special insignias to identify their status. Those operating with U.S. Forces during WWII, particularly overseas, often wore military clothing with other insignia indicating their function. Unique devices including hat badges, pocket hangers, and collar devices were also used. Civilian employees of the U.S. AAF were allowed to wear a modified uniform under specified conditions to identify their status and function. The original regulations (Change One to 1941 AR 600-35 issued 4 September 1942) authorized a special sleeve insignia with a white triangle with the letters U.S. in blue on a blue square 4 1/2 inches in size for civilians having a noncombatant status. Another change (Four of 23 October 1942) authorized a similar insignia with a red triangle for those with a combatant status. Under what circumstances the War Department believed that a civilian could claim combatant status would be interesting to know.