The U.S. military's spending needs in its forthcoming five-year plan -- fiscal years 2017 to 2021 -- present Pentagon leaders, congressional policy makers, and the next administration a double conundrum: how to finance the leading edge of a modernization "bow wave" requiring a sharp, $13 billion increase in FY-21, a year where DOD also faces a potential $41 billion sequester cut. The non-partisan Congressional Budget Office, in a new analysis of future Pentagon spending, heralds the return of the "bow...