The JPMorgan Trust II U.S. Government Money Market Fund (ticker: MGMXX) is a mutual fund that primarily invests in short-term, high-quality debt securities issued by the U.S. government. This fund aims to provide investors with a low-risk investment option that offers stability and liquidity. It is managed by JPMorgan Asset Management and is suitable for investors looking for a conservative investment option with minimal fluctuations in value.