Airships and aerostats carve niche in the U.S. military’s persistent surveillance arsenal: The Avionics Intelligence Report

Avionics Intelligence Report, 25 April 2011. Lighter-than-air vehicles -- also known as free-flying airships and tethered aerostats -- are becoming more common in U.S. Department of Defense persistent surveillance activities. John McHale's video report provides details on airship programs such as Lockheed Martin High Altitude Airship and the Persistent Threat Detection System aerostat.