Tactical Assault Light Operator Suit
With the help of several universities and high-tech companies, the U.S. Special Operations Command has developed a Tactical Assault Light Operator Suit (TALOS) for soldiers to wear in combat. It is essentially a robotic exoskeleton that soldiers wear when fighting in a combat zone. It enables soldiers to withstand bullets and fire, monitor their vital signs, and see in the dark. The Pentagon has dubbed the project the “Iron Man Suit.” There are even reports that the next generation combat suit will be made of liquid metal that can solidify into an impenetrable suit on command. The suits are also expected to increase each soldier’s strength and do pretty much everything but fly. Several prototypes of the suit have been developed, and a first-generation of the suit is expected to be operational with American soldiers in 2018.
That "grenade launcher" in the pic is a Glock 17C pistol in caliber 9mm.