you can't play bounty hunter as class. BH just have all stats same as soldier, cept for no icon and no name. I think that Obsidian wanted to make Mira a BH, but later abandoned that idea and just gived her scout. I thought about restoring BH, but there's no really point in it, as it will be just lightly modified scout.
So if you want to be a bounty hunter, try going scout ;p