Answer:
I may be of the eye, in order I am pie. In my center there is a star, I keep medics where they are. What am I?
Angels and pilots work with me.
I go through a door but never go in, and never come out. What am I?
They are many and one, they wave and they drum, used to cover a stare, they go with you everywhere.
Some try to hide, some try to cheat, but time will show we always will meet.
I never sleep yet sometimes I weep. I can get angry or just be happy. Wherever you go, I will follow. No matter what you do, I will be there. I cannot die. What am I?