Well, considering it's almost impossible to make out any details on infantry sprites due to size, I see no reason to not use that sprite for the British troops. (Especially as I don't know how noticeable the equipment differences would be in the first place) And, if the Americans were wearing khaki too, throw them in. As for Portugal, the equipment was mainly british, but the uniforms were blue. Maybe having a go at the sprite's bmps with paint shop pro could solve that. OTOH, I'm probably the only person around who'll notice... 
Did other armies use the same kind of silly "soupdish" helmet? Just chuck those in too!
Did other armies use the same kind of silly "soupdish" helmet? Just chuck those in too!