Toy soldiers, perhaps naturally enough tend to be a bit nationalistic, if not outright jingoist. Though usually they hover around merely patriotic. This means most countries emphasise toys representing own forces or their obvious rivals. With the switch to single color molded plastic (and the drab single color uniforms) of the post wwii era it became harder to distinguis forces of one nation from another...so marketing to patriotic sentiment in the post war era was usually accomplished by including a flag.
A profoundly gifted Thespian who used his career to make America more American. Go to your rest sir, in knowledge that you have inspired us to be better, rest well, you earned it.