Looking at a great answer to a question about Dragons berthing orientation at the ISS which shows images of the 5 CRS Dragons berthed to the ISS one thing struck me. There looks to be no easy way to tell which mission was which.
They make a badge for each mission, (you can see it by the Webcast page when they broadcast it). But they do not paint it on the side of the Dragon. Nor any visible wording.
The ESA's ATV has badges and names on the side of them. Soyuz/Progress have mission numbers, not sure if they have it painted on the side.
Is there a reason for that?