Mountain Pass Materials, the leading rare earth producer in the United States, has announced that the Pentagon (U.S. Department of Defense) will acquire $400 million worth of its preferred shares, convertible into common stock, thereby becoming its largest shareholder. This acquisition is nearing completion, at which point the Pentagon will hold a 15% stake in the company, with the potential for further share increases. Notably, Mountain Pass Materials stands as the sole producer in the U.S. with a comprehensive grasp of the entire rare earth industry chain and ownership of the world's second-largest rare earth mine.