; (B) modifying United States command structures in Japan— (i) to coordinate all United States military activities and operations in Japan; (ii) to complement similar changes by the Self-Defense Forces of Japan; and (iii) to facilitate integrated planning and implementation of combined activities; and (C) additional modifications to the force posture of the United States Armed Forces in Japan, including the establishment of additional main operating locations, cooperative security locations, contingency locations, and other forward operating sites. (3) An identification of challenges to the implementation of the plan required by subsection (a) and any recommended legislative changes, resourcing requirements, bilateral agreements, or other measures that would facilitate the implementation of such plan. (c) Form The plan required by subsection (a) shall be submitted in unclassified form but may include a classified annex. (d) Appropriate committees of Congress defined In this section, the term appropriate committees of Congress means— (1) the Committee on Foreign Relations and the Committee on Armed Services of the Senate; and (2) the Committee on Foreign Affairs and the Committee on Armed Services of the House of Representatives. 1349. Plan for improvements to certain operating locations in Indo-Pacific region (a) Identification of operating locations (1) In general The Secretary of Defense shall conduct a classified survey to identify each United States operating location within the area of responsibility of the United States Indo-Pacific Command, including in the First, Second, and Third Island Chains, that— (A) may be used to respond militarily to aggression by the People’s Republic of China