HUNTSVILLE, AL -- The Army is making the case to congressional appropriators that multiyear procurement authority for two major munition programs -- the PAC-3 Missile Segment Enhancement and Guided Multiple Launch Rocket System -- will yield substantial savings compared with an annual purchase and provide crucial stability for second-tier suppliers. Doug Bush, the Army acquisition executive, told reporters here the Army has provided not-yet-public materials to lawmakers explaining the benefits of bundling purchases of the two missile programs into block...