NEWYou can now listen to Fox News articles! The Pentagon is preparing a dramatic course correction after years of purchasing key missile-defense interceptors in relatively modest numbers — even as China built up the world’s largest arsenal of conventional ballistic and cruise missiles and the U.S. increasingly focused on the threat of a conflict in the Indo-Pacific.Following a string of missile-heavy conflicts, U.S. air defenses have been used repeatedly to protect Israel, American forces in the Middle East and Navy ships in the Red Sea, drawing down some of the Pentagon’s most sophisticated and difficult-to-replace munitions.The Pentagon’s abrupt course correction…