Its a long shot of an answer. I'll do it in 2 parts without being political:
1- there is a lot more to body armor than lab test. In controlled environnement, body armor give out their optimal results. Then these same perfect armor a released into the wild and #### goes sideway with a lot of factors playing roles:
- wear&tear of the armor: soldiers in general tend to abuse their kit and break it. I routinely witness soldiers dropping their body armor with plates in or storing it wet/sweaty. Both proven to reduces effiency of the soft and hard armor. Soft&hard armor need to be replaced after a certain date, it doesnt always happen.
- usage: in order to get maximum effectiveness, one must wear a properly fitter body armor. Then it must be worn properly.
-mentality: you can put the best body armor on someone, doesnt make him a fighter with a fighter mind set. Bullets flying around, regardless of caliber will make anyone seek for cover no matter what armor suit you have on.
-burden: the more armor you have, the less agile you are. There is a balance between protection and agility. It also depends on threats. If most threats are small arm, i'd favor good stand alone plate. If IED is the flavor of the day... You need some more soft armor.
Yes I'd be confident with my 5.56 rifle, yes. Now would I take something else if I was given freedom of choice ? HELL YEAH ! 7.62x51 would be my choice. A nice 16" AR10
PS: the Ratnik communications system has a nato counterpart being developed, wont go into details because not allowed.