Thanks! I got the Killed in Action sticker to work.
Apparently the category Killed in Action, United States of America, American Indian Wars doesn't currently exist, at least at present it is in red on Sgt Faren's profile. I'm assuming the category will need to be created. I think I can do that, but need to know if the category should be broad, ie "American Indian Wars", or if it should be more specific, in this case perhaps "Killed in Action, United States of America, First Sioux Indian War"?