The availability of photos (or lack thereof) is beyond my level of expertise, Lucinda. As I try to make clear, I am very much an amateur. However, I offer the following suggestions based on my admittedly limited experience.
To the best of my knowledge, there is no national repository of photos, something akin to the personnel records. As far as I know, photos of individual servicemen were produced privately. There may have been unit group photos produced officially (such as a recruit platoon, an infantry company, etc). In my casual experience I have seen examples of such. However, I think something of this nature (if it exists) with regard to your inquiry is undoubtedly not available through an "official" source, such as the National Archives. Possible alternative sources would be something such as a unit veteran's association, or the like.
I'm sorry I can't be of more help, but you are seeking something which will no doubt be difficult to find, if it exists. Perhaps someone with more expertise can help.