I think you're confusing maggots which feast upon dead flesh and the larvae from the screw worm fly which feasts upon live flesh.
Check the link below:
http://www.everythingabout.net/articles/biology/animals/arthropods/insects/flies/screwworm/index.shtml
Now that you made me thnk of it, (the naval was an obvious point of attack) the nose and eyes were simply moist, which was all that was required for the eggs to hatch. I had always assumed there was some kind of wound, which they attacked.
"I am Gunnery Sergeant Hartman, your Senior Drill Instructor. From now on, you will speak only when spoken to, and the first and last words out of your filthy sewers will be "Sir!" Do you maggots understand that?"