1. Running directly towards an enemy bunker over open ground is an effective tactic.
2. Shotguns have an effective range of three feet.
3. For women, a string bikini has the same protection as plate body armor.
4. Wearing a helmet is instantly fatal
5. Jumping is an effective way to avoid being shot.
6. RPG's are readily available in major cities
7. Aliens are always hostile towards humans
8. Said aliens can take over the world with little difficulty, but one person with an underpowered pistol and a crowbar can defeat them. Also, a single untrained engineer can clear a ship of aliens, even though they just wiped out a crew of battle hardened, heavily armed marines.
9. Highly trained enemies have difficulty shooting straight and understanding the concept of cover.
10. There is no difficulty using unknown alien technology against them.
11. Sleeping, waiting, or hiding can cure any ailment including but not limited to, gunshots (especially to the head), burns, impact from large falls, grenade blasts, vehiccle collisions, etc.