Just watched A New Hope for the 157th time but I've only just realised that Chewie doesn't get a medal. He follows Han and Luke up the carpet and up the stairs only for Leia to give Han and Luke a medal but not Chewie. Maybe that's why he roars.
Not to mention all the other rebel pilots who got fuck all.
IABU - He's only a Wookiee after all.
IANBU - Yes, he should have got a medal.