Keep him free-Buy War Savings Stamps issued by the United States Treasury Dept" poster
The pattern
This still is filed under War-bond ask.
Define
Money is requested as duty. The instrument is financial. The motive is belonging to the effort.
Mechanism
Civic purchase. The buyer is not shopping. They are enlisting with a wallet. Price is framed as participation.
Verdict
A public or communal instrument needs wide subscription and the stake is genuinely shared.
Why it works
It uses the bald eagle as a stand-in for the nation itself, making the concept of 'freedom' tangible. The juxtaposition of the natural symbol of America with modern war machines (biplanes) creates a striking image of defensive strength.
Steal this when
You want to evoke patriotism and a sense of protective duty to motivate a financial contribution.