The President's News Conference
07/22/1962
https://www.presidency.ucsb.edu...
I also urge our citizens to pause during this day to rededicate themselves to the principles and ideals for which our flag stands.
But I have spoken thus far only of the military challenges which your education must prepare you for.
In times past, a simple phrase, '54-40 or fight' or 'to make the world safe for democracy' - that was enough.
Above all, you will have a responsibility to deter war as well as to fight it.