I've met so many people of my son's generation who think a sacrifice is when their satellite or Internet is out for a day and that the country owes them something. That old J.F.K. quote about 'what you can do for your country,' doesn't even seem to apply to so many people.
I'm always a big fan of if you approach somebody politely about something and you're not a nudge - you're just pretty honest and simple, my kind of philosophy is that I'm not afraid of 'no,' and that's way different than 'I won't take no for an answer.'