To best of my understanding, the Japanese used captured, British weapons as well ?
At picture # 6 clearly shows a loaded Japanese, "ammo strip", which was used on the licensed of copy of the french Hotchkiss, M14, machine gun, called by the Japanese as the, "Type 3" heavy machine gun, firing the 6.5x50 Arisaka round.
The helmets are standart japanese army/military.
Picture # 1 shows a Japanese "knee mortar" just behind the empty artillery casing ?
Also at picture # 6, shows few loaded rifle clips for the Japanese Arisaka rifle ?
The water canteens look Japanese as well ? On of them apears to have bullet hole through it ?