The list of war crimes I can pin on US during that time is mostly indefinite imprisonment in Guantanamo if you allow for the efforts Obama made to reduce torture.
https://www.hrw.org/news/2017/01/09/barack-obamas-shaky-lega...
Drone strikes are not war crimes according to this definition:
https://en.wikipedia.org/wiki/War_crime#Definition
The list of war crimes I can pin on US during that time is mostly indefinite imprisonment in Guantanamo if you allow for the efforts Obama made to reduce torture.
https://www.hrw.org/news/2017/01/09/barack-obamas-shaky-lega...
Drone strikes are not war crimes according to this definition:
https://en.wikipedia.org/wiki/War_crime#Definition