The other men are unidentified.
When my Aunt Polly (Dean's daughter) saw this photo on the site, she wrote to me asking where I got the photo. I replied that it was in a box of WW I letters that Dean had written home to his parents. It was one of the post-card photos so popular at that time. Aunt Polly then sent me the following note:
Dear Dianne,
Let me tell you the story about that picture of Dean as a soldier.
Al and I were in charge of decorations for the Eugene alumnae dinner commemorating the sesquicentennial of Willamette U. (That's 175 years, I figured out!) Anyway, we contacted the university to see if they had any old photos we could use. It seems that there was an amateur photographer in the early days who took jillions of pictures all around Salem. Years after he died, his son was rummaging around the basement and came across all these old negatives. He donated them to Willamette, and since W.U. had an archives-type class, the kids went to work on the negatives as a class project. They had printed up a bunch of them, so Al and I were invited to thumb through to see if there was anything we could use. All of a sudden, there was Dean! "That's my Daddy!" I squeeled. They printed me up a copy, which is perhaps typing paper size. I asked Mother if she knew the other men and she did not. I went to some other older W.U. grads who lived at Terwilliger Plaza, and they didn't know them either. Obviously, Dean had a copy at that time which he probably sent home. Mother had never seen it before.