Well............our RAF research group has wrestled the CO down to one of two people.
Either way:
It is the earlier part of the 1920s
It is Egypt or Iraq
The season is winter - hence the 'temperate' climate clothing, rather than lightweight KDs that you would associate with a hot climate.
Oh, and the CO's helmet is fashioned from a "Benghazi Bowler" the well known pith helmet.
Tall, isn't he

Dave