Actually even just declaring no quarter is itself a war crime.
Hes also liable for the death sentence, 18 U.S.C. § 2441 — War Crimes Act (1996) & 10 U.S.C. § 950t — Military Commissions Act (more relevent)
alt Hacker News
Hes also liable for the death sentence, 18 U.S.C. § 2441 — War Crimes Act (1996) & 10 U.S.C. § 950t — Military Commissions Act (more relevent)