A tremendous source for information (including photographs) of Vietnam is the Vietnam Archive at Texas Tech University. The Vietnam Archive is the largest non-governmental holder of Vietnam related material. The great part is the scan and place on line (for free) all non-copyrighted materials. If you go to the following website
http://vietnam.ttu.edu/virtualarchive/index.htm you can search the online holdings. I came up with approximately one thousand documents and about 100 images. There is a tremendous amount of material on line and takes a bit to figure out the best phrases to use in your search, but well worth it! You can limit the search by material that you desire.
The Vietnam Archive is also collecting oral histories for all of you associated with the war, either military or civilian and even protestors are welcome.