; silicon, 0.60 percent; or copper, 0.60 percent; or (ii) containing more than 0.25 percent of any of the following elements: aluminum, chromium, cobalt, columbium, molybdenum, nickel, titanium, tungsten, or vanadium. (B) Metal alloys consisting of nickel, iron-nickel, and cobalt base alloys containing a total of other alloying metals (except iron) in excess of 10 percent. (C) Titanium and titanium alloys. (D) Zirconium and zirconium base alloys. (12) Additional definitions In this subsection: (A) The term United States includes possessions of the United States. (B) The term component has the meaning provided in section 105 of this title. (C) The term acquisition has the meaning provided in section 131 of this title. (D) The term required form — (i) shall not apply to end items or to their components at any tier; and (ii) means in the form of mill product, such as bar, billet, wire, slab, plate or sheet, and in the grade appropriate for the production of— (I) a finished end item delivered to the executive agency