Echo, I am liking that character. The HK416C doesn't see nearly enough use as it should. 

One idea that I am punting now, and it's a really curious one, is that of a provisional loadout, either a breacher or explosives specialist in particular that could be using a heavier loadout of armor than usual. As in, think the Demolitions from MoH- reinforced ballistic helmet, blast armor, nothing overbearing (it's not a fucking EOD suit to start with), but this: 

[img]http://www.xboxachievements.com/images/screenshots/2257/med_mohw_e3_screen003.jpg[/img]

This isn't someone who runs round in streets shooting at people like some God (Big, keep your trap shut here), but basically gives them additional explosives and ballistic protection because they're involved with breaching or uhh, explosives. It's there as a passive protection, so that if the first thing they do run into is a shotgun, they won't be blown apart, or at least, the chance of grievous wounds are far reduced. The way I am proposing it is not someone makes a character centered around that build- but for example, will be something given to one or two characters on a "loud" operation, where the team is involved in particularly heavy operations, while on stealth they'd be with regular kit.