The President's News Conference
04/24/1956
https://www.presidency.ucsb.edu...
In this spirit, citizens from all walks of life, of all religious faiths and racial backgrounds, unite annually to work and to give together...
The need for effective civil defense planning is still vital to our national welfare.
I continue to urge all Departments and Agencies to prepare for these exercises to the fullest extent possible.
National plans and preparations are of little value without active participation at local community levels.