Correct me if I'm wrong, but wasn't fuel, ammo, & ord, usually delivered on carts or trucks? I mean I used to watch the old show "wings" and they'd show footage of fuel and ammo being delivered by trucks, or tractor carts, in the case of bombers the bombs rode on those little bomb "trains" where they tow 5 or so carts behind a tractor. I think the OP has a good point, planes didn't pull up to a gas station and fill up like in "1941".