U.S. military contractors will need at least three years to replenish stockpiles of three key weapons systems used in the Iran war. WASHINGTON(AP) — U.S. military contractors need at least three years to replenish stockpiles of three key weapons systems used heavily in the Iran waraccording to an analysis released Wednesday, adding to concerns that American forces would have limited firepower in any future conflict with China. The weapons systems are Tomahawk cruise missileswhich are used to strike targets deep inside enemy territory, and Patriot and THAAD interceptors that defend against incoming missiles and drones. “The United States has enough…