Senior Army acquisition leaders appear resigned to accept a substantial price tag for mounting larger guns on Europe-based Stryker vehicles, arguing the urgency of the project leaves them no other choice. Under the plan, the service would spend $411 million to modify 81 vehicles, a brigade's worth, prompted by an operational needs statement that called for the ability to destroy lightly armored vehicles with the Stryker's armaments. The weapons are needed, officials have argued, to ward off potential Russian land...