If you can't go across with a gun, come across with your part of the Red Cross war fund, by C" poster
The pattern
This still is filed under Recruiting duty offer.
Define
Join us, framed as who you become, not as a job listing.
Mechanism
Identity offer. The role is a self. Benefits are secondary to the person you will be after you say yes.
Verdict
We are recruiting into a hard, proud, or transforming role: service, craft, a company with a real culture.
Why it works
It uses clever wordplay ('go across' vs. 'come across') to directly equate a financial donation with physical military service. It removes the excuse of not being able to fight by offering an equally vital alternative.
Steal this when
You want to offer a non-physical or indirect way for an audience to participate in a larger, noble cause they cannot directly join.