Question

during the us occupation of japan after world war ii, japans military was
used to help rebuild cities,
retrained by the us military.
used to help build a police force.
dismantled by the us military.

Explanation:

After World War II, during the US occupation of Japan, one of the key goals was to demilitarize Japan. This involved dismantling Japan's military. Rebuilding cities was more related to civilian efforts and aid. Retraining the Japanese military by the US military goes against the demilitarization aim. Using the military to build a police force also doesn't align with the main demilitarization policy.

Answer:

dismantled by the US military.