International organization and administration — Miscellaneous — United States servicemen serving with NATO forces in Belgium — Legislation providing for recovery of medical expenses by United States against third-party tortfeasors — Provision for subrogation of injured party’s rights to United States — Whether such legislationcan be given effect in Belgium — Whether fact that no corresponding right for Belgium relevant — Whether fact that serviceman off duty at time of accident relevant — NATO Status of Forces Agreement, 1951 — The law of Belgium

States as international persons — In general — Recognition of acts of foreign States and governments — Legislation of foreign States — Recovery of medical expenses by United States against third-party tortfeasors — Legislative provision for subrogation of injured party's rights to United States — Whether such legislation should be given effect in Belgium — Whether fact that no corresponding right for Belgium relevant — NATO Status of Forces Agreement, 1951 — The law of Belgium