CCAC Releases 2016 Native American Dollar Candidate Designs
Native American Code Talkers from more than thirty tribes served with distinction and played an important role in concealing the nature of secret communiques between American forces.
I'd probably go with one of the more abstract ones: 1, 2, 3, 6, or 9. With a slight preference for 6. The others seem a little too specific and busy, although 10, 11, and 16 are okay.
CCAC Reviews 2016 Native American Dollar Designs
By Les Peters
For more on the subject, see 2014 Dollar to Honor Lewis and Clark and 2013 Sacagawea Dollar Reverse Unveiled.