Who are these men ?

This photo was in Dad's diary not stuck in just  included.

It is I am sure a group of POWs at  OFflag 79, there's an ink stamp on the back of the photo for Voigtlander a German photographic company with it's main base in Brunswick which is where Oflag 79 was.

Most likely taken in the brief period between liberation and repatriation, a few days of freedom in and around the camp before the inevitable farewells and 'must keep in touch'  conversations. Maybe an enterprising local German turned up with a camera and film to record friendships and groups of men soon to be separated as they returned to homes around the globe.

 I've seen it many times and puzzled as to who the men are, having enlarged it and looked carefully I think the chap third from the left is actually Dad. A much thinner Dad than pictured on his German POW ID card card and even more so than he is on the post-war photos.
Having read about the events of the final months of the war I know that food was more and more restricted especially for POWs who would have been low down on the list of concerns for what remained of a functioning German state. Starvation rations at best.

Dad had already been a POW for 3 years and would have been a very low weight leading up to this time.

The men are smiling and looking relaxed, if I am right about the timing of this they're free and will soon be home.

 I can imagine it being an almost happy end of term end of school end of troubles sort of atmosphere.
A transitional moment of the sort we all experience at various times in my life but few of us transitioning in quite the same dramatic circumstances as this.
It would be great to identify these men, a little bit of a missing puzzle for descendants maybe,  a gap in the family history filled.

There are two signatures on the back, names of I can't fully decipher and don't match up with other names in the diary, unlikely I know but if anyone sees the photo and recognises any of these men please let me know.