Thank you all very much for your interest and suggestions.
Not sure why I didn't think of it before, but your suggestion of a nick name made me realise that the photo belonged to Jessie JOSEPH, so indeed, it could be addressed to "Josie/Josee" as a pet name for her.
Jessie was a nurse during WWI in Sydney (Australia), I have another photo of her laughing surrounded by men of different armed services. Perhaps this was someone she nursed, though I would think he would then send a photo in uniform. Perhaps not related to the war at all. Though I think it unlikely he was Turkish (though it was a good suggestion shume).
"Texas" is an interesting suggestion - again a possible nick- name, though not much help to me in trying to work out who he may be!
