problem with GUID

I'm trying to join MOHAA 3v3 ladder and when I enter the password of the team, it says I need a GUID to join the competition. When I go on my profile, I see where I have to enter my GUID but, first what the hell is a GUID and second, there is no medal of honor allied assault on the list. There is mohaa2, mohpa but no allied assault... thanks to help me

Hi.

A GUID is a globally unique identifier that is used as an identity check for anticheat purposes.
The required GUID is that from your UAC3 account (www.uac.ac)
Just go through the drop down menu and select UAC guid and enter your UAC user id number. Afterwards you can join your team.

thanks revo