conserving resources at home so troops can have more.
Explanation:
According to the excerpt from Roosevelt’s State of the Union address, the speaker talks about the patriotic spirit of Americans and how they put patriotism above appetite by sacrificing a portion of their meals so that troops abroad can have more food.
Both the speech and the poster convey the importance of conserving resources at home so troops can have more. This is because, the idea of rationing was brought up and well embraced by the American people.