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Roadside bombs have long represented the greatest killer of soldiers in Iraq and Afghanistan, but there's hope beyond the sturdy little demolition bots that already work with their human handlers. The Pentagon now has two aerial drones on the testing docket as possible countermeasures for improvised explosive devices (IEDs)--one of which we're calling 'Helipanda' for the remainder of this post.

While most research directed at improving UAVs focuses on upgrading their weapons or sensor packages, the Naval Research Laboratory is also working to ensure that the next generation of killer drones are as fuel-efficient as they are deadly. And a recent test of their hydrogen-fuel-cell-powered Ion Tiger UAV proves how successful they have been: it staid aloft for just shy of 24 hours on a single fuel load.

Like most Army commanders, Lt. General Rick Lynch says that he needed more troops in Iraq, and that they would have saved the lives of men lost under his command. Unlike most commanders though, Lynch isn't demanding flesh and blood soldiers, but steel and rubber robotic infantrymen.

Speaking at the Association for Unmanned Vehicle Systems International conference, Lynch said that robot systems already in place could have saved 122 of the 155 men who died during his time in Iraq.

Surrogate Predator: A Cessna 182 wears the sensor ball of a Predator  Lon Carlson, L-3 Communications

Cessna 182 aircraft have become converted "Surrogate Predators" with the installation of a "Predator ball" that typically serves as the surveillance and tracking eyes for drone operators. Such Predator balls give the manned Cessnas the ability to lock onto targets and track them.

Drones already rule much of the skies over modern day battlefields, and could someday begin ferrying cargo to forward bases and troops. The U.S. Air Force put out a call this week for a fully autonomous unmanned air vehicle that can deliver cargo within a combat radius of 500 nautical miles.

After almost 15 years of spying on America's enemies, and occasionally blowing them up, the venerable Predator and Reaper drones currently used by the Air Force will have to be replaced, sooner or later. The Pentagon has put out a contract for the next generation of UAVs, and Stephen Trimble of The DEW Line has the first shots of Lockheed Martin's stealthy entry, the MQ-X.

In this video, exclusive to PopSci.com, Captain Adam Brockshus narrates a Hellfire missile strike on a group of insurgents in Afghanistan. As a Predator instructor pilot, Brockshus was called into the Ground Control Station to oversee a former student who was taking his first shot in combat.

Click on for an inside look at how the hundreds of attack missions using unmanned aircraft are executed.

Between scientists warning of autonomous killer robots and a Predator drone killing Osama bin Laden's son, news about killer robots has been eating up a lot of bandwidth lately. But most of that press has focused on the Air Force's Predator and Reaper unmanned aerial vehicles (UAVs).

A new unmanned combat aircraft could soon wing its way to the battlefield and land with the precision of a helicopter. The Excalibur recently completed its first flight to demonstrate those abilities using a hybrid turbine-electric propulsion system.

The unmanned aerial system (UAS) could pack a 400-pound payload of four Hellfire missiles, and also deliver weapons or other supplies to warfighters deep in rough territory. Its design allows it to have a maximum speed of 460 mph, but also have the ability to loiter overhead at just 115 mph.