Answer:
I save lives on the ground and in the air. What am I?
What type of shoes do spies wear?
Whoever made me doesn't want me. Whoever bought me doesn't need me. Whoever uses me doesn't know me. What am I?
Face with a tree skin like the sea. A great beast I am. Yet vermin frightens me.
What can travel around the world while staying in a corner?
What never gets any wetter no matter how hard it rains?