The U.S. Naval Research Laboratory (NRL) recently managed to fly a fuel-cell powered Ion Tiger UAV for 48 hours and 1 minute using liquid hydrogen fuel in a new, NRL-developed, cryogenic fuel storage tank and delivery system.
There are quite a lot of people who are seriously concerned about maintaining their privacy in an age where aerial drones - like the Parrot AR - are increasingly easy to build or buy.
The US Federal Aviation Administration (FAA) predicts that up to 10,000 commercial drones might end up in American skies after new guidelines are improved.
The Defense Advanced Research Projects Agency (DARPA) is currently working on an initiative that would allow large drones to take off and land from the surface of small warships - rather than gigantic aircraft carriers.
Not all of the drone aircraft deployed by militaries are actually large flying machines. Case in point? The uber-mini Black Hornet, manufactured by Prox Dynamics, which is slightly reminiscent a military-style MeCam.
When hearing the phrase "surveillance drone," most people probably think of large-scale unmanned flying aircraft deployed by the military or federal government.
DARPA - the Defense Advanced Research Projects Agency - is known for designing a variety of high-tech and futuristic platforms for the US military.
A security company known as Secom has unveiled what it claims to be the world's first automated flying surveillance robot targeted at private security companies - rather than military or government entities which typically require drones surveillance missions.
New drones use a tether for power - significantly increasing their duration.
The United States military has been operating its armed MQ-9 Reaper drone since 2007.
A reasonable individual would probably assume US surveillance drones conducting recon missions over combat zones would be broadcasting an encrypted video feed.
The US Navy is testing at least one remote-controlled combat vessel.
The Lethal Miniature Aerial Munition System - or LMAMS - weighs less than 5 pounds. Ultimately, the US Army wants the kamikaze drone to be capable of attacking a target up to 6 miles away in 30 minutes or less.
The Pentagon is steadily increasing the use of various drones across several branches of the military.
Unmanned aerial vehicles have seen extensive deployment in both Iraq and Afghanistan.
The deployment of unmanned aircraft by law enforcement agencies within the continental United States is obviously a controversial topic.
Defense company Lockheed Martin is showcasing its one-winged SAMARAI drone at the Association for Unmanned Vehicle Systems International in Washington.
A robot and a drone have failed to complete their respective missions to inspect and measure contamination levels in Japan's hard-hit Fukushima nuclear plant which was damaged by a devastating tsunami in March.
Under a contract from DARPA, AeroVironment Unmanned Aircraft Systems has created a hummingbird spy drone, the first two-wing, flapping-wing aircraft that carries its own energy source and can hover as well as move forwards.
A military stealth drone that needs no human control at all took its first test flight on Friday.