What I'm looking for is which episode of this show has a scene I remember.
Buck and a friend crash their fighters in a desert planet. They survive unhurt, look around and the friend says there's no civilization around and if they can't call help fast they'll starve. Buck points at a small animal and says "no we won't". The friend is horrified that people used to eat animals in the 20th century but ends up eating the meat along with Buck out of necessity. This scene establishes that 25th century society is vegetarian.
I asked this same question in TVTropes' YKTS sction, but didn't get a definite answer.