Darrell, would your picture be about 8x10 in size? I don't know if what you have is a group of navel men stationed on Guam or not.
My father was stationed on Guam with the navy. He worked on picking up crashed airplanes. Is this the branch of service you are mentioning? I do not know what group he served with.
I do know that he took many pictures of his group there as well as native people, buildings, crashed planes, etc.
He also had an 8x10 picture. All of these where in an album. From numerous times of being opened for people to look at, the pages started falling out. I found on the back of this picture the names of many in that group picture. Perhaps your picture also has signatures on the back.
If I ever find out just what group Dad was with, I plan to list the names found on the back of this picture here.