You may wonder what XXTB and the logo represent.
XXTB, unofficially, stands for the 20th Tank Battalion of the 20th Armored Division of the US Army.
The 20th Armored Division was an armored division of the United States Army that fought in World War II. It was activated on 15 March 1943 at Camp Campbell in Kentucky.
You can reference a Wiki page if you like, at:
https://en.wikipedia.org/wiki/20th_Armored_Division_(United_States)