By the time Gung Ho! was released, no serious player of ASL could deny that the system had become a highly complex and detailed game system that retained little of the playability of the original Squad Leader. Gung Ho introduced a complete order of battle for both Chinese forces and the United States Marine Corps, (along with the applicable Chapter H pages providing DYO values and special vehicle notes describing any special in-game characteristics for each Chinese vehicle and ordnance type, as well as a brief history of each, and also notes on amphibious craft as used by both sides in the Pacific). For anyone who had bought all the modules to date, they found that their rulebook was overflowing, with Chapter H alone having 112 pages. The second half of Chapter G was included, with special rules for amphibious operations, beach and ocean terrain (as well as more terrain overlays to help simulate these), tropical climate rules, new fortification types, and even rules for bulldozers. Prerequisites for this game included the rulebook, Beyond Valor, Yanks, West of Alamein, and Code of Bushido, as well as board 2 from SL.