Weekly photo challenge: Everyday life

Everyday life for a soldier in Egypt in 1941 included some pretty unpostable activities:  rifle practice, wrecking tanks, sinking ships, covering  the bodies of dead comrades in the desert.  However, the activity in this photo looks fairly harmless.  My father captioned it ‘Shufty’, which comes from an Arabic word for ‘a look’, as in ‘take a shufty at this’.

Three curious things I’ve considered:  What are the tubular projections behind the men?  What is the Egyptian boy doing?  Why is one man naked while all others are clothed?

Shufty, Egypt, 1941