- Archive Panic : The series is already pretty long as of January 2011. Even longer as of January 2017.
- Memetic Badass : Several. Former US president Teddy Roosevelt is one from the get-go (but this is a typical Running Gag of AH.com, so it's not that surprising).
- Nightmare Fuel : Lots of it. Especially what the Grex do to captured living beings and territory. And corpses of fallen soldiers, Brrr.
- Paranoia Fuel : As already mentioned, the Grex can easily infect and impersonate anyone and spread the disease and destruction further. There are few sure-fire ways of how to prevent this, each of them unpleasant, but still better than the worst alternatives.
YMMV / Swarm on the Somme