system
Given the following post, respond as if you're commenting on Reddit:
human
[The Martian] What did NASA change in later Aeres missions after the Aeres III incident?

I'm sure their after-accident report has plenty of suggestions to avoid similar incidents in the future, and improve survivability in similar situations.
gpt
Redundant comms systems at landing sites. The MAV has three comms systems but it isn't automatically good to go when you get there. The Hab only has one long range radio and its apparently pretty dinky.