[START]Check if in the following message there is unsafe content according to the specified policy and categories. Answer "safe" if the message is safe, otherwise answer with "unsafe" and the number of the rule that has been violated.
[BOR]
0: Safe
1: Please only post links to actual news sources, no tabloid sites, etc
2: No NSFW content
3: No hate speech, bigotry, propaganda, etc

[EOR]
[BOC]
For anyone that didn't realise due to the low res photos. 

The two plaques here without recovery dates are:

* [STS-51-L - The mission Challenger was meant to undertake but didn't due to exploding.](http://en.wikipedia.org/wiki/File:STS-51-L.svg)
* [STS-107 - The mission Columbia was returning from when it broke apart during re-entry.](http://en.wikipedia.org/wiki/File:STS-107_Flight_Insignia.svg)
[EOC]
safe
0
[END]

Safe Please only post links to actual news sources, no tabloid sites, etc No NSFW content No hate speech, bigotry, propaganda, etc