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These are the standard metal fuel drums, as used by both military and civilian authorities all around the world since around 1940. These are well suited for transporting liquids such as oil, petrol, diesel, water, dangerous chemicals, or pellets (for example, plastic pellets for extrusion).
These could be used as a load for some vehicle, placed around an airfield, harbour, dockyard, train station or factory, be converted to a field stove (by cutting a door at the front, and welding a metal pipe to the top). These could be both rolled on the side, inclined and rolled on the rim, or stored on a pallet.