Question

what effect did wwii have on the u.s. military?
reliance on surplus made the military outdated.
the military grew, making the u.s. a superpower.
bloody attrition drastically shrank the u.s. military.

Explanation:

During WWII, the U.S. military expanded significantly in size and capabilities. The war - time industrial mobilization and large - scale recruitment led to its growth, which was a key factor in the U.S. emerging as a global superpower after the war. The U.S. did not become outdated due to surplus, and its military did not shrink drastically due to attrition; instead, it grew.

Answer:

The military grew, making the U.S. a superpower.