Recruitment and training? 

In recruitment it says that Delta is only for Army green berets and Rangers who want to try out for it(or are asked I guess).  However, links under Background show a recuitment ad for all millitary personel to come to a 1st Special Forces Operational Detachment-Delta orentation.  It lists a bunch of requirments that someone must first have but it specifically states that Delta is open to people from other services.

Which one is right?  Is delta open to all branches or not?  It's a little unclear.