Some units and service members purchased novelty items that commemorated their participation in tank gunnery. The ones I have seen generally relate to units that were stationed in Germany. Beer steins and cigarette lighters seem to be the most common items. See Figures 1-2 for an example.
Figure 1
Figure 2
Beer mug from 3rd Bn, 32nd Armor (3rd Armd Div) 1975 TCQC. Note that the patch on the mug does not match the design of the 3rd Armored Division 1975 Distinguished TCQC patch.