Hi
Hard to say without a pic of the tattoo. Off the top of my head the Screamin Eagle style from Harley Davidson would probably make a good centre piece and the black of the feathers would most likely cover the lettering.
You might want to consider some extra filler if there is a lot of space – what else do you as an american find patriotic (apart from the flag)? If there is another symbol might also be able to work that in.
Good Luck
Matthew