How did American soldiers become soldiers and what was their mentality?

The United States began to implement the volunteer system from the 1970 s, and all soldiers volunteered to join the army. Therefore, the US military is a professional army (as opposed to an army dominated by conscripts). In order to attract young people to join the army, the US military provides better treatment, accommodation, medical insurance (including immediate family members), housing and shopping subsidies, and a relatively acceptable pension. After retirement, you will continue to have medical insurance (medical treatment in veterans hospital) and university scholarships. And American soldiers are likely to be sent to serve in their bases around the world, which is equivalent to free travel. Finally, the U.S. military has high technology, so it can learn skills after serving and come in handy after retiring. These are used to attract people to join the army.