Much of the recent national discussions about asymmetric warfare and asymmetric threats has been lacking a rigorous understanding of the dimensions of asymmetry in warfare. Because opponents in warfare are always looking for an asymmetric advantage against their adversary, the term asymmetric warfare fails to have a useful meaning. Warfare asymmetry discussions understandably address the War on Terror and U.S. homeland defense, with the focus on nonstate, nontraditional threats. From a national security perspective, however, it is equally important to address asymmetric approaches plausibly employed by potential adversaries during conventional campaigns that will most likely be of a limited-objective nature. This report examines the nature of asymmetry In a conventional campaign from a maritime perspective and, In particular, that which might constitute an asymmetric threat from under the sea. Exploitation of the maritime undersea environment presents unique options for inferior force anti-access/area-denial capabilities, necessitating unique superior force access options. Military strategists and planners must further examine the risk that these asymmetries pose and must examine the use of U.S. asymmetric strengths. It is expected that, when the maritime challenge of limited-objective conventional campaigns is examined from an asymmetric and inferior force perspective, U.S. strategy, tactics, applied technology, and military investments will need adjustment to reduce the uncertainty of the risk posed by asymmetric threats and to increase U.S. preparedness.