Who is Rex Porter, WW1 Anzac?

There’s no question that we all get frustrated at uncaptioned photos. They are the bain of every genealogist or historians life. It’s Murphy’s Law that we’re bound to come across the most awesomest photo in the family collection, but it’s uncaptioned. Which leaves us with so many questions. Who is in the photo? Where was it taken? When was it taken? What was the occasion? And so on …

But here’s one that IS captioned that GIVES me so many questions, so I’m sharing it in the hope that someone can help answer some of them.