Capital Crimes

WAR CRIME - 18 USC 2441
18 USC § 2441: (a) Offense.— Whoever, whether inside or outside the United States, commits a war crime, in any of the circumstances described in subsection (b), shall be fined under this title or imprisoned for life or any term of years, or both, and if death results to the victim, shall also be subject to the penalty of death. (b) Circumstances.— The circumstances referred to in subsection (a) are that the person committing such war crime or the victim of such war crime is a member of the Armed Forces of the United States or a national of the United States (as defined in section 101 of the Immigration and Nationality Act). (c) Definition.— As used in this section the term “war crime” means any conduct— (1) defined as a grave breach in any of the international conventions signed at Geneva 12 August 1949, or any protocol to such convention to which the United States is a party.

GENEVA CONVENTION (IV) 12 Aug. 1949
The Geneva Convention (IV) relative to the Protection of Civilians in Time of War, Chapter 7, Article 50 obligates the coalition (as a fmr. occupying power) to ensure 'registration (...) maintenance and education (...) of children who are orphaned or separated from their parents as a result of the war'. Article 55, 56, and 59 is on the rest of the victims' right to basic necessities.

DEFINITION OF 'OCCUPYING POWER'
Oxford Dictionary: 'A state whose army occupies (part of) a foreign country'.

DEFINITION OF 'OCCUPATION' IN INTERNATIONAL LAW
'Territory is considered occupied when it is placed under the authority of the hostile army'.

AIDING & ARMING THE ENEMY
Aiding the enemy, 10 U.S.C. § 904, art. 104
Providing material to foreign terrorists, 18 U.S.C. § 2339B

TREASON - 18 USC § 2381
"Whoever, owing allegiance to the United States, levies war against them or adheres to their enemies, giving them aid and comfort within the United States or elsewhere, is guilty of treason and shall suffer death, or shall be imprisoned not less than five years and fined under this title but not less than $10,000; and shall be incapable of holding any office under the United States".

EXPERIMENTATION WITHOUT CONSENT - THE NUREMBERG CODE
The Nuremberg code formed part of the legal ground on which the Nazi doctors got capital punishment.
Section 1: 'The voluntary consent of the human subject is absolutely essential'.