SCRANTON, Pa. (AP) — One of the most important munitions of the Ukraine war comes from a historic factory in this city built by coal barons, where tons of steel rods are brought in by train to be forged into the artillery shells Kyiv can’t get enough of — and that the U.S. can’t produce fast enough.

The Scranton Army Ammunition Plant is at the vanguard of a multibillion-dollar Pentagon plan to modernize and accelerate its production of ammunition and equipment not only to suppor …