Never Before Have We Had So Little Time In Which To Do So Much' — Franklin D. Roosevelt" poster
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
It uses the authority and recognizable face of the President to deliver a sobering message about urgency. The solemn portrait gives the quote immense gravity.
Steal this when
When you need to convey urgency and have a highly respected figurehead to deliver the message.