The game itself occasionally...mostly use the Virtual Arsenal tool to visualize such outfits & loadouts.
More than couple of reasons:
Identification - not necessarily unit identification alone but also flag patches (if we have the option, I'd reckon many troops would love to wear a flag patch).
Plus, there are certain models of tactical cameras, flashlights, IR strobes, NVG battery packs/Counter-Weights that make use of Velcro interface. Examples:
In short, Velcro on the helmet has myriad uses for the operator who learns to make proper use of it.
These Velcro-based attachments become all the more necessary if the particular model of comm headset you have uses the side rails for retention, occupying that spot.
The radio itself (which can be stored on the vest somewhere) doesn't matter, more than likely it will be indigenous one. The point in question is the
headset that allows for comfortable push-to-talk communication without having to reach for the radio brick handset every now and then, and also affords a level of protection against shrapnel, hearing loss (common problem for soldiers) etc.
i.e. this part -
The headset is connected via the cables to whatever radio system you have, the radio itself is typically carried in one of the pouches on the vest like this (right-most pouch) -
Or on the back -
It's a welcome change in my opinion. Most important part would be if we remove the need to tuck in the shirts (a tradition we only carry forward as a hangover from old British Indian Army days).
Instead, I feel we ought to go in for the American approach of an untucked uniform, it would be far more comfortable for the wearer. The difference between the British & American styles is clearly visible here:
View attachment 6641
That, and the next major improvement would be if we change the camouflage patterns we have. It is clear that IA requires theatre-specific colors on their camo patterns. The Multicam pattern and its numerous color variants, in my opinion, would be the perfect replacement for the current camouflage.
. Different training I suppose. 
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