We never commemorate a day honoring our country without listening to a recording of Gen. MacArthur's last speech at West Point. I think it's one of the finest examples of American oratory ever:
Duty, Honor, Country.
Those three hallowed words reverently dictate what you ought to be, what you can be, what you will be. They are your rallying points: to build courage when courage seems to fail; to regain faith when there seems to be little cause for faith; to create hope when hope becomes forlorn.
You can listen to the complete sound recording in MP3 format here. I never make it to the end without bursting into tears. It's that good.