parchment_alpha
  from https://opengameart.org/content/old-parchment-paper
  by cron ( https://opengameart.org/users/cron )
  License: CC0 (public domain)

humans_win
  from https://openclipart.org/detail/158611/vietnam-soldier-profile-silhouette-dingbat
  by studio_hades (https://openclipart.org/user-detail/studio_hades)
  License: CC0 (public domain)

aliens_win
  from https://openclipart.org/detail/270230/impressed-alien-fixed
  by The Martin (https://openclipart.org/user-detail/The%20Martin)
  License: CC0 (public domain)