Our boys need sox" 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 boils down a massive war effort into a highly specific, familiar domestic task. The slogan 'Knit Your Bit' plays cleverly on 'do your bit,' turning a passive hobby into an active contribution. The huge lettering ensures the message is read instantly from a distance.
Steal this when
You are asking a community to contribute labor rather than money, and want to frame a mundane task as a crucial part of a larger mission.