498. Crimes Under International Law
Any person, whether a member of the armed forces or a civilian, who commits an act which constitutes a crime under international law is responsible therefor and liable to punishment. Such offenses in connection with war comprise:
a. Crimes against peace.
b. Crimes against humanity.
c. War crimes.
Although this manual recognizes the criminal responsibility of individuals for those offenses which may comprise any of the foregoing types of crimes, members of the armed forces will normally be concerned, only with those offenses constituting “war crimes.”
499. War Crimes
The term “war crime” is the technical expression for a violation of the law of war by any person or persons, military or civilian. Every violation of the law of war is a war crime.
500. Conspiracy, Incitement, Attempts, and Complicity
Conspiracy, direct incitement, and attempts to commit, as well as complicity in the commission of, crimes against peace, crimes against humanity, and war crimes are punishable.
FM 27-10
Department of the Army Field Manual
The Law of Land Warfare
Department of the Army • July 1956
http://www.afsc.army.mil/gc/files/fm27-10.pdf
Section II. Crimes under International Law