I really don't like how a security player can have the same middle-eastern accent that the insurgents have.
It's hard enough keeping track of who you're supposed to be shooting since you switch teams all the time. I really don't need identical voice-overs adding to the confusion. And I swear I've heard some security guys shout "Allahu Ackbar" a few times, which really throws me off.
So please make the security forces have their own distinct accents. It could even still be middle-eastern if the devs really need it to be for some reason, just make it noticeably different than the insurgent one.