I spoke with a guy that flew P-38s late in the Pacific and their training in the P-38 was one of the planes had the radio and armor removed from behind the pilot's seat and the knelt behind the pilot who showed them how to work everything and where it was. After that, they were on their own. All of the guys in Bob's group had only flown single engines prior to that (P-39, P-40 mainly). He was surprised they never had any dual engine trainers first. He said the first 20 hours in the P-38 were pure adrenaline. He also said that if they had lost an engine on take-off early on, they would be doomed. But he did say once you got the feel for it, it was a great plane.