This might be the first step to bringing him back.
From the wiki it says...
http://en.wikipedia.org/wiki/Chief_Noc-A-Homa
“When it was revealed that Chief Noc-A-Homa would appear on the Braves 2013 batting practice caps, it drew criticism, stating that the logo is offensive against Native Americans.”
The Braves and Walker parted ways in the 1985 off season.
Walker wanted a pay raise (from $60 per game) and the Braves, well, the Braves were dissatisfied with Walker's history of failing to show up when he was supposed to be there.