White male born 2-14-79 in Hawaii

I recently found out from my mother that my older brother and I have a middle brother between the two of us. My mother would not give me any details as to the name of the adoption agency or hospital they used but I am assuming it would have to be one of the military hospitals due to my father being in the Marines and stationed there. Any help from anyone who might know of a male child born and adopted around this time will be greatly appreciated. Thank you all in advance for any help.