premise: Captain America's shield is used as a type of equipment.
hypothesis: Captain America . Captain America wears a costume that bears an American flag motif , and is armed with a nearly indestructible shield that he throws at foes . Captain America 's shield is a fictional item appearing in American comic books published by Marvel Comics . It is the primary defensive and offensive piece of equipment used by the Marvel Comics superhero Captain America ; he is seldom seen without it . Over the years , Captain America has had the use of several different shields of varying composition and design .