India, May 28 -- US military contractors need at least three years to replenish stockpiles of three key weapons systems used heavily in the Iran war, according to an analysis released on Wednesday, adding to concerns that American forces would have limited firepower in any future conflict with China.

The weapons systems are Tomahawk cruise missiles, which 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 munitions for any plausible scenario in the Iran war, but the depleted inventories have created a window of vulnerability for a potential Western Pacific conflict," the Centre for Strategic and International Studies s...