Treaty on Open Skies (OS)
The Treaty on Open Skies establishes a regime of unarmed aerial observation flights over the territories of its signatories. The Treaty is designed to enhance mutual understanding and confidence by giving all participants, regardless of size, a direct role in gathering information through aerial imaging on military forces and activities of concern to them. Open Skies is one of the most wide-ranging international arms control efforts to date to promote openness and transparency in military forces and activities.
Check out the photo gallery for a glimpse of various observation flight activities. Also see photos from Second Review Conference for the Open Skies Treaty and Defense Threat Reduction Agency.