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U.S. doubts Iran claims it shot down drones

The Pentagon has found no evidence to back Iran's claims it shot down drone surveillance aircraft in the Gulf, officials said on Monday, acknowledging some of the spy planes had crashed due to mechanical failure. Full story

Unmanned aircraft tracks Arctic seals, sea ice decline

An unmanned drone soaring over the Arctic recently had two missions: Take pictures of the declining sea ice and pinpoint the location of seals on chunks of the ice. Full story

Hydrogen-Powered High Flier Could Replace Satellites

The Global Observer, an unmanned airborne vehicle (UAV) that is designed to stay aloft for up to 7 days at an altitude of up to 65,000 feet while carrying a 400-pound payload, had its first flight last month. The launch from Edwards Air Force Base in California marked the beginning of a test progra Full story

NYT: U.S. military recruits robot warriors

War would be a lot safer, the Army says, if only more of it were fought by robots. Full story

'Flapless' aircraft steered by air bursts

Look Ma, no flaps! Pieces of the wing and tail that move back and forth to help control aircraft, flaps have been used to control flight since the Wright brothers -- until now. Full story

Hydrogen-powered high flier could replace satellites

The Global Observer, an unmanned airborne vehicle (UAV) that is designed to stay aloft for up to 7 days at an altitude of up to 65,000 feet while carrying a 400-pound payload, had its first flight last month. The launch from Edwards Air Force Base in California marked the beginning of a test program Full story

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  Iran unveils new drone

Iran says it has developed its first un-manned drone aircraft, a 13-foot-long bomber it calls "an ambassador of death." NBC's Brian Williams reports.

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This aerial view, taken by unmanned aerial vehicle (UAV) of Air Photo Service on March 24, 2011 shows Tokyo Electric Power Co (TEPCO) Fukushima No.1 nuclear power plant.
This aerial view, taken by unmanned aerial vehicle (UAV) of Air Photo Service on March 24, 2011 shows Tokyo Electric Power Co (TEPCO) Fukushima No.1 nuclear power plant.

This aerial view, taken by unmanned aerial vehicle of Air Photo Service on March 24, 2011 shows Tokyo Electric Power Co Fukushima No.1 nuclear power plant at Okuma town in Fukushima prefecture. At left is the damaged fourth reactor, while at right the damaged third reactor. HANDOUT RESTRICTED TO

Karrar drone aircraft
Karrar drone aircraft

This photo released on Sunday, Aug. 22, 2010, by the Iranian Defense Ministry, reportedly shows a launch of the Karrar drone aircraft, which Iran says is the country's first domestically-built, long-range, unmanned bomber aircraft at an undisclosed location. Iranian President Mahmoud Ahmadinejad Sun

Predator unmanned aerial vehicle prior to a mission
Predator unmanned aerial vehicle prior to a mission

Members of the 11th Reconnaissance Squadron from Indian Springs, Nev., perform pre-flight checks on the Predator unmanned aerial vehicle prior to a mission, in this November 9, 2001 file photo shot at an undisclosed location. In the rugged mountains of western Pakistan, missiles launched by unmanned