I think it best if I refrain from saying whether the Australian birth certificate is genuine or not. For what it is worth though and my hobby is family history, I checked on the names of his parents.
Alaric Edgar Robert Bomford.
Doreen Betty Bomford (formerly Loxton).
I find Doreen Betty Bomford (Loxton) 1928-2002) is interred at Houghton Cemetery in Australia. Her husband is Al Bomford and various children are named including David. I had thought I was onto something when I could not find any Alaric Bomford. Yet, Alaric was the name of a fierce Germanic leader who helped destroy Rome in the fifth century. Not a name that would have gone by without some jesting in that country, Australia.
Sufficient to say, I guess "Al" does it. I merely offer this for what it is worth. Again, America deserves better of the Presidency. A more open Presidency.
What about the kinds of forms used at that time? Does the Bomford doc look like similar AU contemporaneous forms?