Ok, yeah that's a freaking huge log.
I'm about 15 seconds into looking at it and holy crap your list of mods. There is about a 95% chance that's your issue right there. Some are even trying to load twice!
You have the air drops set to land every 5 game hours. That's quite often already.
Honestly though, the core of your issue is most likely a mod. You've got a real rats nest there. Then it starts spamming errors on zombie actions, so at a minimum your entities are corrupted, which is where the supply drop spawns from.
Your log is so massive because it's a truckload of errors caused by your mods.