It is a bit bizarre given the role the US Army played in that genocide. But the Army does only use those tribal names with formal permission from the tribes themselves.

Interesting! Do you have any more information on that? Never knew.

The only information there resembling 'formal permission' is this quote -

>On June 10, 2012, Lakota elders ritually blessed two new South Dakota Army National Guard UH-72A Lakotas at a traditional ceremony on the Standing Rock Reservation in North Dakota. Ceremonies like these happened often over the past several decades.