The Law of War: Can 20th-Century Standards Apply to the Global War on Terrorism? is the ninth offering in the Combat Studies Institute's (CSI) Global War On Terrorism (GWOT) Occasional Papers series. Mr. David Cavaleri, a retired Armor lieutenant colonel and CSI historian, has produced a study that examines the evolution and continued applicability of the corpus, both conventional and customary, that constitutes the law of war. As background, Mr. Cavaleri provides a theoretical framework and the development of the law within Western and, specifically, US Army doctrine and regulation. He then presents a case study of the British suppression of the Mau Mau insurgency in 1950s Kenya, a conflict with particular resonance today.