There are several cloud environment provided by Microsoft. E.g. Microsoft Azure Government Cloud (MAG), Microsoft Azure Commercial (MAC) or public cloud, Office 365 (public) cloud and several other Government cloud in EU and Asia. For US Gov there is Office 365 GCC cloud.
Is Office 365 GCC meant for US Government only? Or is it available outside US also?
Have you seen the Office 365 GCC service description? I think that should help answer the question.