The Caribbean Anti-Smuggling of Trafficked Arms Act, or CAST Act, mandates that the Secretary of Defense , in coordination with the Secretaries of State and Homeland Security, submit a comprehensive report within 180 days of enactment. This report is to be delivered to specified congressional committees and focuses on the potential expansion of the Joint Interagency Taskforce South's mission . Specifically, the report must assess the feasibility of expanding JIATF South's role to include combating illicit arms trafficking in the Caribbean region. It also requires a summary of any necessary adjustments to existing treaties or agreements, an estimation of the cost and additional resources needed for such an expansion, and an assessment of the required coordination efforts with various law enforcement agencies.