Editors' introduction -- Numbers matter, Gary J. Schmitt and Thomas Donnelly -- Protracted wars and the Army's future, Frederick W. Kagan -- Age and indifference: the erosion of U.S. air power, Loren Thompson -- Numbers and capabilities: building a Navy for the twenty-first century, Robert O. Work -- The Marine Corps: a hybrid force for a hybrid world, Francis G. Hoffman.

Editors' introduction -- Numbers matter / Gary J. Schmitt and Thomas Donnelly -- Protracted wars and the Army's future / Frederick W. Kagan -- Age and indifference : the erosion of U.S. air power / Loren Thompson -- Numbers and capabilities : building a Navy for the twenty-first century / Robert O. Work -- The Marine Corps : a hybrid force for a hybrid world / Francis G. Hoffman.