Differences among nations in cultures, languages, doctrines, procedures, and materials pose specific requirements for NATO forces for current operations and for the future. The quality of service today especially depends upon how the differing elements can operate together. Optimized interoperability leads to increased mission effectiveness through improved cohesion, performance, and speed, and it radically lowers the expenditures. This applies to the military medical sphere too; the proper interoperability level results in increases in both capability and capacity. Within the NATO military medical community, the Committee of the Chiefs of Military Medical Services in NATO (COMEDS) is the coordinating body for the NATO Military Committee (MC) regarding military medical policies, doctrines, concepts, procedures, techniques, programs, and initiatives. To meet the new requirements with the available resources, multinational solutions are increasingly applied in the whole spectrum of expeditionary military medical support. International cooperation in primary and secondary care, in medical evacuation, in preventive medical care, and in medical staff functions is common today.