He has since published two novels, World at War: Revelation and Everyone Dies in the End, as well as several short stories.
The games are squad-level wargames in which a counter can represent a squad, a vehicle or a person such as a sniper or a commanding officer.
Lock ’n Load: Band of Heroes, published in 2006 by Matrix Games, is set during World War II.
A platoon-level game system set in an alternate history in which NATO and Warsaw Pact fought a Third World War beginning in May 1985.
Walker also designed several smaller board wargames for free publication in Armchair General Magazine, although none of them were particularly challenging to hardcore gamers.