The proliferation of unmanned aircraft systems (UAS) offers great potential but also risks further segregating airspace if not properly integrated. Over 250 UAS models are being developed by over 40 countries operating over 80 types. This diversity, from micro to long-endurance systems, provides flexibility but current "bottom-up" development lacks overall strategic vision. Without integration procedures, UAS risk operating independently instead of networked. A comprehensive command and control system is needed to realize UAS full potential and align with NATO transformation goals of increased interoperability.