This year, the US Defense Advanced Research Projects Agency (DARPA) will spend nearly $3 billion to develop new military technologies. A huge chunk of that money will go to automation tech, including some absolutely incredible robot warriors.
Here are the most impressive battlefield robots that US taxpayer dollars have bought.
Of course, clumsy robots are so 2015. An upgraded version of Boston Dynamic's bot, epically named "Atlas, The Next Generation," was unveiled in 2016.
Atlas, The Next Generation uses laser imaging (LIDAR), stereo sensors in its head, and more sensors in its limbs to aid with balance and movement. As such, it's a lot less clumsy than the first-generation Atlas, even in snowy test conditions.
In creating the new Atlas, Boston Dynamics used 3D printing to embed hydraulics in its structure, custom tailoring parts to be smaller and more lightweight. As a result, Atlas, The Next Generation stands 5 feet 9 inches (1.8 metres) tall and weighs just 180 pounds (82 kilograms).
Not all US military robots carry weaponry but this, the Talon Swords, sure does. It's armed with a six-barrel, 40 mm grenade launcher. Other weapons options for the Talon include an M16 rifle, M240 machine gun and M202A1 Flash incendiary rocket launcher.
Talon robots were deployed in Iraq in 2007, though their weapon systems were never used.
Talon robots aren't all about offense; the tech is key in dealing with roadside bombs and other improvised explosive devices.
The Talon's seven cameras (including thermal- and night-vision) and long-range shield its operator from threat, allowing them to safely identify bombs from as far as 1,000 meters away. Remote-controlled Talons also assisted in the 9/11 recovery effort.
The Talon is designed to cross snow, sand, water and drastically sloping terrain, with a top speed of about 5.2 miles per hour (8 km/hr). It's strong, too, with a towing capacity of nearly 750 pounds (340 kg).
"We always demonstrate its strength by having the Talon IV latch onto a soldier's gear and pull a prone soldier through a few lanes," Army Sgt. 1st Class Rocky Duran said.
This is the successor to the armed Talon Swords robot, the Modular Advanced Armed Robotic System (MAARS), currently in testing. Like the Talon, MAARS has both lethal (machine guns, high explosives) and non-lethal modules (warning sirens, tear gas).
The US Army is hoping to have the 370-pound (167 kg) bots see action within the next few years.
The Marine Corps has been researching the use of MAARS to provide extra firepower -- and thus, better protection -- for foot patrols.
Loaded with a M240B machine gun holding 450 rounds and four M203 Grenade Launchers on a 360-degree turret, MAARS is more than up to the task.
Caption byFox Van Allen
/ Photo by Lance Cpl. Juilen Rodarte/USMC
Boston Dynamic's BigDog, seen here, is arguably the most infamous DARPA robot. The 3-foot-long (92 centimeters), 2.5-foot-tall (76 cm) robot animal was designed to traverse challenging terrain while carrying a 340-pound load (154 kg).
This is the LS3, Boston Dynamic's successor to the BigDog. It's something of a robotic pack mule, designed to operate through human voice command. It can follow a soldier while carrying up to 400 pounds (180 kg) of equipment.
LS3 prototypes can run as fast as 7 miles per hour (11 km/hr) on flat surfaces, or between 1 and 3 miles per hour on rough terrain (2-5 km). It's also capable of righting itself without human assistance.
Remote-controlled battle robots date back to World War II. In that conflict, Germany used Goliath tracked mines, which were 820-pound (370 kg), 5-foot-long (1.5 meter) mini-tanks designed to hold large amounts of explosives.
The tech had an easily exploited weakness, however. Cutting the 650-meter-long command cable that connects the bot to its operator rendered it useless.
The USSR, too, developed its own unmanned weapons in the 1930s and '40s. The TT-38 teletank (right) was a radio-controlled assault vehicle piloted by a human inside a TU-38 (left) up to 1,500 meters away.
There were at least two Soviet teletank battalions fighting on the Eastern Front of World War II.