This video introduces Visibility functionality in Military Tools for ArcGIS in ArcMap. Visibility takes into consideration what can be seen by an observer from a given location. Analysts use key terrain, observation posts, and other locations to assess capabilities (what can be seen) and vulnerabilities (what cannot be seen). The Visibility tools use elevation data paired with observer information to produce linear line of sight (LLOS) and radial line of sight (RLOS) information. More information can be found at http://solutions.arcgis.com/defense/help/military-tools/arcmap/visibility-introduction.htm