Now, If They Can Solve the Power Problem...

[kham]

Turns out, the problem with this thing, is the same thing Tony Stark had in the movie; The POWER
And unfortunately, the ARC Reactor was fictional
But the rest? Workin' on it....

US Army RDECOM - Tactical Assault Light Operator Suit (TALOS) Combat Simulation

I love how it's the Mark V already
More here

[Mynock]

Batteries don't just need to get better, they need to get non-explosive. Even if you could make a lithium battery pack that would run an exo suit there is NO DAMN WAY I'd put it on my back and go get shot at.

[nachtjaeger]

Hard to believe they could make it stand up to rifle fire at close range.

[kham]

If it's powered, you can use thickness in your armour that you wouldn't normally consider. Again, the power thingy
Plus, No One, Ever, is going to be wielding a .50 like an AR.

[Mynock]

There's ceramic composites that can stop small cannon shells now. Could probably go with that and keep the weight down to a quarter ton or so.