Article 1 Code of Crimes against International Law (CCAIL)
Part 1 General provisions
Section 3 Acting upon orders
Whoever commits an offence pursuant to Sections 8 to 14 in execution of a military order or of an order comparable in its actual binding effect shall have acted without guilt so far as the perpetrator does not realise that the order is unlawful and so far as it is also not manifestly unlawful.
Manifestly unlawful order
Superior orders - national proceedings
EDIT.