You can help prevent food shortage in U.S. every family should have a good garden : every farm a big patch of potatoes and beans
The pattern
This still is filed under Civilian war-duty equate.
Define
A civilian act (saving, making, staying quiet) is framed as the same duty as the front.
Mechanism
Moral equate. The small act inherits the gravity of the large one. The ask is ordinary. The meaning is not.
Verdict
We need mass compliance on an unglamorous behavior and can honestly tie it to a shared stake.
Why it works
Uses fear of a negative outcome ('prevent food shortage') as the hook, then immediately breaks down the solution into specific, manageable actions for different groups (families, boys and girls, farms).
Steal this when
When tackling a crisis requires assigning specific, distinct responsibilities to different segments of your audience.