Prudens Futuri -- Halleck and Upton : the prelude -- Root, Ludlow, and Carter : 1899-1904 -- Bliss and Wotherspoon : 1905-1917 -- The testing of the blade : World War I -- McAndrew charts a new course : 1919-1940 -- The second testing : World War II -- The joint era : 1945-1950 -- A new era begins : 1950-1957 -- In support of national strategy : 1957-1963 -- Emphasis on the role of the Army : 1963-1966 -- "Where are we today?" -- Providing for the future.