Clark Gregg may not have have worn the suit in Iron Man 2, but in this video Gregg tries on Raytheon's XOS 2 exoskeleton — it's more or less a battlefield version of Ripley's power loader.

This suit is designed to ameliorate lifting large amounts of supplies and ammunition and carrying heavy loads on the battlefield. Said Raytheon Sarcos vice president of operations Frasier Smith, "Those guys are typically moving 16,000 pounds a day. That's a pretty outrageous amount of weight for a person to be lifting," You can read more about the suit and Gregg's testing of it at Comic Book Resources.