Allied Burden Sharing Report Act

This bill requires the U.S. Secretary of Defense to submit an annual report to Congress by March 1st detailing allied nations' defense contributions. It directly affects NATO members, Gulf Cooperation Council countries, Rio Treaty signatories, and key partners like Australia, Japan, South Korea, and the Philippines. The report must include each country's annual defense spending (in nominal dollars and as a percentage of GDP), their military contributions to joint operations, any restrictions on those contributions, and U.S. or allied efforts to address such restrictions. The report will be submitted to specific congressional committees on defense, foreign affairs, and appropriations.