H.R. 2973 would require the Department of Defense to report to the Congress on its coordination with U.S. allies in the Middle East to protect them from Iran, Iranian-backed groups, and other violent or criminal groups. The report would focus on threats to the allies’ naval forces and seaborne commerce. On the basis of information about the cost to prepare similar reports, CBO estimates that satisfying the bill’s reporting requirement would cost less than $500,000 over the 2024-2028 period. Any spending would be subject to the availability of appropriated funds.