The Battle Kings were a derivative of the Super King models now featuring military liverys. Even with that series aiming at the military collectors they were first marketed as toys in child-friendly colours (ever seen a Sherman tank in metallic gold in action?). Later models were then painted in realistic military green colors. The series died a sudden death in 1980 when it was no longer politically correct to sell military related toys.
Here you find all available models with the numbers BK-101 to BK-107.
Here you find all available models with the numbers BK-108 to BK-119.