I don’t know either as I also had to supply a DD 214. I applied on line in Nov and the instructions said I needed a birth certificate. When they called me to ask a couple of questions they said I no longer needed one.
I guess it varies. I also asked them if they needed a copy of my DD214, and they said they could probably find my service information. I just gave them the dates of active service, and they said that would probably be all they needed. They never asked for a DD214. Apparently, they were able to verify everything I told them with no documents from me.