A bill to require the Comptroller General of the United States to submit a report on the manner in which delays in arms deliveries to Japan, Taiwan, and the Philippines affect the ability of the Department of Defense to build and sustain a strong denial defense in the First Island Chain.

This bill, designated as S. 4223 in the 119th Congress and introduced on March 26, 2026, aims to mandate the Comptroller General of the United States to provide a report detailing the impact of arms delivery delays to Japan, Taiwan, and the Philippines on the Department of Defense's capability to establish and maintain a robust denial defense within the First Island Chain.