If you want desert, you must have snakes, and elephants, don't forget the elephants!
How about you have snakes which roam around bases, looking for food. They will eat anything that moves, including people. Imagine one of those things crawling up in your cockpit! They would give a pilot wound, and spread from plane to plane. They will live in bunkers and multiply quickly if not stopped.
This brings me to elephants. Elephants will wander around in search of food. Unfortunately, the resident officer just loves his salad. They too, will destroy just about anything to eat, except they just stomp through low planes and snap bombers' wings like twigs.
Neary: Hey, did you hear that?
Penguin: What do you mean?
Neary: I mean that trumpeting noise
Penguin: Now that you mention i-*SNAP, elephant destroys both me and Neary*!
System: The Elephant destroyed you, then it stepped on you, and then it laughed (or) [insert snide remark here]
* elephant returns to herd, therby, "landing" *
System: Elephant has found 2 salads, Elephant wants more...
-Penguin
