ANZAC stamps: L5 gun & crew - who is it?

From Frank Parry:

NZ Post has produced a set of ANZAC commemorative stamps, which are now on sale in both a 6-stamp block and as first day covers.
-----One stamp pictures an L5 and crew in sandbagged position. Can't identify gun crew.
-----Thought this may interest Association Members who may wish to purchase a set.
-----Would also be interesting to know names of crew and location.