Hello, I am glad that I came across the post about a bronze marker for William J. Osterberg, LT, USN.
He was my father.I am William Paul Osterberg.I have one sister Judith Van Sciver (formerly Judith Ann Osterberg).
My sister used to live in or near Camden, Maine which must explain (somehow) the marker that you have found.I have contacted her and we will stay in touch about this.
My father and my mother (Phyllis Heard Osterberg, formerly Grace Phyllis Heard) is buried along with my mother in Rhinebeck Cemetery, Rhinebeck NY.
We have a great deal of information about our family tree, especially on our mother's side.On my father side, we have more limited information.My father's father emigrated from Sweden around the turn of the 20th century. His eventual wife emigrated about the same time from Norway.