I was 12A
Yeah, my first duty when I got to Germany was acting commander of A Co, 2d Bn, 37th Armored Reg, 2d Brigade, 1AD. The CO was on leave and the XO had an emergency, so the butter bar was in charge! Since I was older and prior service, they gave it to me instead of the other baloon leaders. Didn't have a clue how to run a tank company. But I used the magic words, "First Sergeant" and all went well.