A new Army force-generation model, designed to better match up ready formations with commanders' requirements, sets out a new framework for how the service will reach into its reserve component to complement active-duty forces, according to officials and documents. The Army has been overhauling the model, known as ARFORGEN, as part of the Army's preparations for what follows the Iraq and Afghanistan wars. Operations in those conflicts have stressed the service's ability to provide trained forces for an extended amount...