Many Americans believe that there are a couple of services that are better managed by the Government than private enterprises. These include:
1. Primary Education
2. National Defense
3. Local Law Enforcement
4. Infrastructure Development
5. Disaster Relief
Some other services can include, Intelligence, Foreign relations, Healthcare, housing etc.
While the United States is a capitalist economic system, practically it is more of a mixed economy. That is, while the majority of businesses and services are privately owned, there a re a couple of services that the government does better.
For example, while private companies are involved in manufacturing weapons, the overall National Defense is the responsibility of the government.
Similarly, many private businesses supply the Police department, but the overall law enforcement is the responsibility of the government.