To amend section 844 of the William M. (Mac) Thornberry National Defense Authorization Act for Fiscal Year 2021 to change the applicability of the amendments made by such section, and for other purposes.

This bill delays the start date for a rule that restricts the Department of Defense from buying certain metal products from specific countries. The new rule will only take effect on January 1, 2032, or sooner if the Secretary of Defense certifies that enough reliable suppliers exist outside those restricted nations. It also requires the Defense Department to update its purchasing regulations within 120 days of the bill's passage. These changes directly affect how the military procures materials and give officials flexibility to wait for better supply options before enforcing the restrictions.