There are some great attempts out there to update SF, but it looks like Wizards (aka Hasbro) squashed a lot of the websites for copyright infringement.
I just turned 50 in November so I'm not helping the average much...
GM Heath:
OOC: Not sure if you want to still attack them. They seem to have lost interest in you, and you have depleting ammo. Not to metagame, but you fulfilled the purpose here (to destroy the EMP emission), and taking down the sentries is not necessary. You may return here later after obtaining further information and supplies for as yet undisclosed purpose. If you kill the sentries now, that will be two less in the future, but either way is fine.
Because this format stretches time out so far...I may have forgotten what our original goals were. Here's what I recall at this time:
1) Rescue the Captain
2) Examine the shiny thing in the river
3) Help the crash victims (did we already do this?)
Whatever we do, we should return to the aircar and see if we can get it repaired. Much faster travel around this rock to meet the timelines that are rapidly ticking away.