Senate lawmakers want a new assessment of the military’s ability to counter high-volume salvos of advanced missiles against joint force critical fixed sites and high-value assets, considered “one of the greatest threats” to U.S. forces posed by Russia and China that is forecast to grow as competitors expand their inventories of weapons that stress existing U.S. air and missile defense systems. The Senate Armed Services Committee in its mark of the fiscal year 2022 defense policy bill includes a provision...