In Brat: Kids of Warriors when the kids first arrive in Germany they stay in a medieval castle where they see a knight’s armor. In that scene Queenie tells Lt. Col. McMasters that because he is a tanker he is a modern day knight. This video does a good job showing you the transition from a medieval knight’s suit of armor to modern tank warfare. Looks like Queenie might have been correct.
Early on Charlie tells Jack that his family had been stationed at Fort Knox, Kentucky, and that his father Lt. Col. Carron had been responsible for designing the new tank range at Knox. If you keep watching this one long enough you’ll see actual tank training at Fort Knox.