Harpoon 4, by Larry Bond and Chris Carlson handles all aspects of maritime combat: surface, sub-surface, and air. Harpoon 4 is a system of detailed but comprehensible rules covering the many facets of modern naval actions. Consistent rating systems and evaluations of the capabilities of modern naval vessels, aircraft, submarines, and helicopters make it possible to achieve realistic results when simulating known situations, by extension Harpoon 4 also achieves realistic results with hypothetical scenarios. Harpoon 4 can answer questions like: Are carriers powerhouses or sitting ducks? Can transatlantic convoys survive in a modern wartime environment? In the cat-and-mouse games between US and Russian submarines, which is better?