You never know who will appear in a search at GoogleBooks. The site http://books.google.com contains images of millions of pages of books–some out of copyright and others not.
An entry was even located for my uncle, a career marine during the approximate 1920-1950 time frame. I never expected to find a reference to him, but there it was. One never knows what references could be located with a search of GoogleBooks at http://books.google.com