I think Britain was the first to come out with this style of patriotic army recruiter poster. After this the U.S. followed with Uncle Sam and I believe Russia had one for Stalin maybe. Link: http://www.allposters.com/-st/Propaganda-Vintage-Art-Posters_c18502_.htm
When war is declared, Mary North leaves finishing school unfinished, goes straight to the War Office, and signs up. Tom Shaw decides to give it a miss - until his flatmate Alistair unexpectedly enlists, and the conflict can no longer be avoided. Young, bright and brave, Mary is certain she'd be a marvelous spy.