I was originally issued a M1 helmet when I joined the Marines in 1982. We liked them because they were utilitarian. You could boil water in one, it served as a bucket, a seat and had a very high cool factor. Hell, these were the same helmets the Devil Dogs of World War 2, Korea, and Vietnam all wore. My first complaint with the "new helmets" in 1984 was, "How the hell am I supposed to hear anything behind me with this thing on?" They seriously hindered sound from behind you. You couldn't boil water in them either.
This looks like it just compounds that concern and adds to it, "How the hell am I supposed to communicate with my fellow Marines with this thing on?"
I guess if they install helmet to helmet communication systems it would all work for the communication aspect, but there is no way you are hearing anything of the ambient environment sounds around you with that helmet on.
I can give the designers props for trying to design armor for our fighting men. If these save lives I'm all for it. I'd love to hear the murmuring of the troops when they are issued these. I bet it sounds a lot like our murmuring of 1984.
Have we seen this before?
I think all would be forgiven if they start issuing blasters.