1. Enhanced domestic content requirement for navy shipbuilding programs (a) Enhanced domestic content requirement (1) Contracting requirements Except as provided in paragraph (2), for purposes of chapter 83 of title 41, United States Code, manufactured articles, materials, or supplies procured as part of a Navy shipbuilding program are manufactured substantially all from articles, materials, or supplies mined, produced, or manufactured in the United States if the cost of such component articles, materials, or supplies— (A) supplied during the period beginning January 1, 2026, and ending December 31, 2027, exceeds 65 percent of the cost of the manufactured articles, materials, or supplies; (B) supplied during the period beginning January 1, 2028, and ending December 31, 2032, exceeds 75 percent of the cost of the manufactured articles, materials, or supplies