The 4koma posted by HinataShou has as translation in the same folder as the Track Zero Chapters:
http://www.mediafire.com/angelbeatstrackzero
Direct link:
http://www.mediafire.com/download.php?bmjlm1vmzbp
Unfortunately they forgot to include the first page so I'll include a translation:
Title:
Angel Beats: Our Battlefront March
Welcome to the SSS!
First comic:
It's the SSS!
Yuri:
I'm Yuri
I'm the leader of the SSS
Yuri:
Every day I'm with idiots
And also their idiot friends
I'm surrounded by idiots
Yuri:
IS THERE ANYONE OTHER THAN IDIOTS?
Yusa:
He doesn't have a heartbeat
Yuri:
He died this time because his entire body was beat up
It doesn't matter because this is the afterlife