US SB3420

Creates a Special Envoy for Humanitarian Aid Workers with ambassador rank, appointed by the President to report to the Secretary of State, responsible for investigating deaths, injuries, and detentions of aid workers on U.S.-supported humanitarian missions

Prohibits U.S. security assistance and defense articles to foreign countries that unlawfully kill or fatally injure humanitarian aid workers, unless the Secretary of State certifies the country has investigated violations and taken corrective action

Establishes the Aid Worker Independent Inquiry Group within 60 days of the Special Envoy's appointment, composed of representatives from the Departments of Justice, State, FBI, and intelligence agencies to assess aid worker deaths and detentions

Requires incident reports to Congress within 90 days of any aid worker death or detention (45 days for U.S. citizens), detailing circumstances, munitions used, foreign military involvement, and whether U.S.-transferred weapons were involved

Mandates annual reports to congressional committees on conflict zone working conditions, security challenges facing NGOs, effectiveness of UN humanitarian coordination, and U.S. humanitarian assistance distribution