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The High-Altitude Long-Endurance Demonstrator (HALE-D) was a subscale prototype built by Lockheed Martin as part of its High Altitude Airship (HAA) program. The program has been shut down.

The HAA was intended as an unmanned, untethered, lighter-than-air (LTA) vehicle operating autonomously in the stratosphere for sustained, ultra-long-endurance missions, lasting months, as a stable, geostationary platform suitable for multi-mission sensor operations. It would provide troops with...

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