Infantry - Red Artillery - Yellow Engineers - Black Signals - Purple Cavalry - Light Blue Aviation - Sky Blue Police - Carmine Medical - Green Supply - Salmon Pink Adopted by King Rama V so that command would be easily given during the good old days. It then became shoulder boards and cap band during World War 1 for an obvious reason which the French didn't figure it out why they're men are bing shot from a far because they are wearing blue and red uniform. I agree with the shamble state of the Signal corps and I shall report the shamble state of this group the High command wouldn't be please. The even in the wrong pace! One the RTAF (Royal Thai Air Force) is created one more colour join in Aviation - Sky Blue And yes they are not bearskin they are these plumed helmet same with the cavalry but different form of holdings inside.