Ironically, the standards for being too crazy to kill someone in war are a lot lower that the standards for being sent to prison for acts done while seriously mentally ill. Cf. Guthrie v. Shrink, 1 Alice's Restaurant at 8:40 (1967)
Unfortunately, malingering rarely works for our clients, and they'd have to do a hell of a lot better than what's in the pamphlet, given the applicable standards:
Doc: Your attorney's name is Jack. Do you know who your attorney is?
Client: I think his name's Jack.
Doc: Good. And there will be a person a black robe; that's the judge, and a person in a grey suit; that's the prosecutor. You understand that, right?
Doc: Good. And you're charged with A, B, and C, right? Now, what are you charged with?
Client: A, B and D?
Doc: Good, and you feel that you can talk with Jack about your case?
Client: Yes, so long as the pigeons that tell me to poop in my pants won't be there...
Doc: Congratulations! You're competent!
(no, it's not really that egregious, but sometimes it feels like it)