https://en.wikipedia.org/wiki/American_Service-Members'_Prot...
> The United States is not a member of the International Criminal Court (ICC). The Act authorizes the president of the United States to use "all means necessary and appropriate to bring about the release of any U.S. or allied personnel being detained or imprisoned by, on behalf of, or at the request of the International Criminal Court". This authorization led to the act being colloquially nicknamed "The Hague Invasion Act", as the act allows the president to order U.S. military action, such as an invasion of the Netherlands, where The Hague is located, to protect American officials and military personnel from prosecution or rescue them from custody.
It was introduced in 2002 when the US invaded Afghanistan and Iraq and hasn't been rescinded. So if the US ever committed war crimes in those countries, or any other ones; too bad. The US so totally and completely doesn't recognise the ICC's jurisdiction that it will literally invade the Netherlands in order to not be bound by it in any way, shape or form.