Allied Burden Sharing Report Act

S 4720, the Allied Burden Sharing Report Act, requires the Secretary of Defense to submit an annual report to Congress by March 1st detailing defense spending and contributions from specific allied nations. The report must include each country's annual defense budget (in nominal terms and as a percentage of GDP), their participation in joint military operations, any restrictions on their contributions, and efforts to address those restrictions. It applies to NATO members, Gulf Cooperation Council nations, Rio Treaty signatories, Australia, Japan, New Zealand, the Philippines, South Korea, and Thailand. The bill mandates unclassified reports with a possible classified annex, making them available to any member of Congress upon request.