This legendary aeroplane was widely used by US reconnaissance pilots during World War Two. The trimetrigon camera setup in the P-38 made it ideal for mapping, and was best illustrated on D-Day when several sweeps of P-38s covered the entire Normandy beach-head landings. The 'dicing' camera, installed in the aircraft's nose, was effectively used during the battle against V-weapons, when pilots flew as low as 15.2m (50ft) to photograph the launching sites.
Yes, that is the plane.
I guess they flew into enemy territory unarmed (not that the little armament of one plane would have made much difference).
I can't imagine what it must have been like in the belly of that thing.