[tsimionescu]

As far as I know, the US have never investigated a member of their government for war crimes, and have always shielded any US army person investigated in another country. It is a very simple policy: by definition, the US is carying out just wars, so there can be no war crimes perpetrated by the US army. At most, regrettable mistakes can be admitted to.

This applies even when international courts have found the US guilty, since the US does not recognize the authority of international courts against them. See the case of the mining of Nicaragua's harbors https://en.m.wikipedia.org/wiki/Nicaragua_v._United_States