No not obligated, as a human being you are free to do what you want with your life and time within the framework of the laws of your country and the teachings of whatever religion you may follow.
However, one famous US president - J.F. Kennedy said "ask not what your country can do for you - ask what you can do for your country" and that is very good advice; you will find that if you serve in your community you will be happier and your community will be a nicer place to live in.
Obligated to serve for a certain lenght of time under a contract
The castle of Good Hope was a military headquarters, it did not serve the community.
USPS.
yes
all males between the age of 18 and 51 were obligated to serve
The Community that they serve is there customers.
By passing on his knowledge.
they fight to serve our community
California Casualty's motto is 'We serve those who serve our community'.
To serve the constitution and community by protecting an individual's constitutionally protected rights.
Neither. Always " obligated to " do something.
The motto of Jamestown Community College is 'To Learn ... To Search ... To Serve.'.