system
Given the following post, respond as if you're commenting on Reddit:
human
[Futurama] How exactly did Zapp Brannigan achieve the rank of 25-Star General?

The man is beyond incompetent, and only many occasions his actions have been responsible for the death of hundreds of DOOP soldiers.  

During the chase of the Planet Express ship he lost the entire crew when they were blown out of the Nimbus.

How exactly did he even make it this far in DOOP?
gpt
Wasn't it for defeating the killbots? 

Edit: Yes at the Battle of the Octillion Systems where Zapp discovered their weakness (the pre-set kill limit). After sending waves of waves of his own men at them they reached their limit and shut down.  Not sure if that was the specific action which lead to his promotion to 25-Star, but it was the kind of brilliance that has made him a hero to us all.