NGS Style Manual‎ > ‎- G -‎ > ‎

government

Lowercase; never abbreviated:
United States (U.S.) government
federal government
Utah government
Chilean government
Her Majesty's government

U.S. government official
the government
state government
government of Chile
the opposition government
government-in-exile
Keep in mind international readers and use U.S. government, not our government.