Possibly Aussie SASR according to a threat on Military Photos for a photo that has been deleted.
http://www.militaryphotos.net/forums/archive/index.php/t-913.htmlAnd then maybe German KSK

and possibly Marines, only going by file title, but they look like regular MP5s to me

aaand finally the SAS

Older SEAL loadouts

Note that none of these photos look very current. So your loadout will be a bit dated. All photos found on Military Photos.net
also appears to be used by the Belarus "Almaz" anti-terrorist group, the Czech URNA and Georgia according to the Wiki article.