Canforce1

Guys wondering if you ever seen when some one joins a server in Bf2 and there IGN changes to say from Killer to Killer-24? I have seen this & was wondering was causes it . It seems they are branded as a name hack after this and it's obvious they are not hackers and who would put a -24 on their name if they wanted to name hack. It seems it is random but I have seen it 3 times before and once to me.