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It looks like a uniform of the New Zealand Mounted Rifles Brigade, the slouch hat in particular looks nearly identical.
Formed in 1914 by the combination of three mounted regiments and disbanded in 1919, the brigade served in the Gallipoli Campaign and the Sinai and Palestine Campaign. The photo looks like it could have been taken in the dry scrubland near the beach where the Australian and New Zealand troops landed.
Plenty of more detailed info on them can be found here.