This is the topic of Senator Obama's commencement address to the 2008 graduates of Wesleyan University in Middletown, Connecticut. Senator Obama was subbing for Senator Kennedy who, obviously, could not make the address.
Obama makes the point that he took a job as a community organizer when he graduated Columbia, rather than pursuing the big bucks on Wall Street. Personally, I don't know what a community organizer is; the image I get is of a paid rabble rouser. He was paid only $12,000 plus $2,000 for a beat up old car. He goes on to describe the value of public service and the many opportunities available. Oddly, he doesn't mention one obvious line of service.
When I hear the term service to one's country the first thought I have is of military service. Senator Obama did not mention it as a course of service to one's country. I am sure that Senator Kennedy would feel quite comfortable with military service, as his brother Joe was killed in WWII and Jack was seriously wounded. President Kennedy was a true war hero. I don't think the words, "ask not what your country can do for you, but what you can do for your country," were a call to community organizing.
A man who is running for Commander in Chief should not be comfortable with ignoring the value of military service.