well i also was tracking the JA3 for a time but it simply got lost in the process. The hired guns thing looked good but it got me mad as hell for its mechanics: Once spotted everyone knows where u are - the baddest thing was that enemy ignores walls and roofs - i almost droped dead when the enemy threw a grenade like 60m away from me, from the inside of one building to the building that I was camped in. OMG Epic FAIL
Secondly while camping next to wall I got hit from the guy on the other side from the wall. OMG almost cracked at that point.
Silent operations? Not one, impossible, the minute you kill someone, the whole area is on.
Althoug this is a problem even by 7.62 but here there are still few things how you can kill silently although requires a lot of conditions to be succesfull.
S.P.M is better cuz you have nonstop influence on behaviour of your units in the fight.
And alt-fire
less clicks. I like the npc logics during fights, they dont see you but at least they try to hide, camp, or shoot in the direction where they think you are camped. nicely scripted.