Sounds weird, right? These are almost certainly going to Afghanistan. While allegedly some Special Forces units have considered using the Mi-17, the U.S. has bought many Mi-17 attack helicopters from Rosoboronexport for use in Afghanistan's military.
The reasoning is that Afghan pilots are short in supply and have strong familiarity with the Mi-17 over domestic models. Moreover, the Mi-17 is evidently better suited for Afghanistan's environment.