Spoiler : "You know what a guidon is. Well, it's a kind o' little swallow-tailed flag. Nowadays every outfit in the army has one. Company flag, you know. All colors. Even the MPs, they got one that's yellow and green. But there was a day when nobody but cavalry had a guidon. Red and white. Top half red with the regiment's number in white. Lower half white with the troop letter in red, like 7-A -- A Troop, Seventh Cavalry. Only when I first enlisted, they still called 'em companies, just like in the doughboys."