It's become harder for people interested in joining a regiment for NaS to find a good regiment that fits what they want simply because the EU and NA gap is virtually non-existent. Sure, there's some minor benefits to having a gaming community on both sides of the pond that dare to play in the same servers, but there's a reason you see MMO's and such having multiple servers for region-specific reasons. Players like to stick around in a game/regiment if the events and servers they play in aren't terribly laggy or difficult to attend due to timezone differences.
Please, simply put somewhere in your thread subject either [EU] if your regiment is European, [NA] if it is North American, [AUS] if it is Oceanic, etc., etc. It helps much more than you realize.