WASHINGTON: The Army's proposed Ground Combat Vehicle would offer less combat power, at a higher cost, than buying the German-made Puma already in production or even just upgrading the Army's existing M2 Bradley, according to the Congressional Budget Office. CBO issued a report today assessing different alternatives to upgrade Army heavy brigades' infantry fighting vehicles (IFVs), tank-like war machines with tracks and turrets designed to carry troops into combat.The non-partisan CBO, Capitol Hill's in-house thinktank, has slammed the Ground Combat Vehicle program before, but never this hard. The office's analysts took the Army's own criteria and created a grading system...