Large quantities of aluminium were used in the framing and cladding of "QE2"s superstructure. This decision was designed to save weight, reducing the draft of the ship and lowering the fuel consumption, but it also posed the possibility of corrosion problems that can occur with joining the dissimilar metals together, so a jointing compound was coated between the steel and aluminium surfaces to prevent this happening. The low melting point of aluminium caused concern when "QE2" was serving as a troop ship during the Falklands War: some feared that if the ship were struck by a missile her upper decks would collapse quickly due to fire, thereby causing greater casualties.