Here is another one:

I WANT YOU GRINGO!
fight in the
MEXICAN REVOLUTION
and be proud to ride with
PANCHO VILLA
Nearest recruiting station
Juarez, Mexico
Dynamiters - Machinegunners
Viva - January 1915 - Viva
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There is controversy whether the poster is real or a spoof. If the message is real, then it would predate the famous Uncle Sam "I want you" poster by about two or three years. Which would mean that the U.S. government copied from Pancho Villa :-)
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Found this comment on website where there was a discussion about the poster:
It is not fake, it's real. Pancho Villa was recruiting not only in Mexico, but in the U.S. to fight against the corrupt government at the time. And a lot of "gringos" actually did join the Mexican revolution, because they fought for a cause, which was to free the people from oppression. If I'm not mistaken, I think it was mostly Irish who joined villa, because they were being treated badly in the U.S. and knew what it was like.
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Xipe Totec the other day posted about the Irish soldiers who fought for Mexico against the U.S. troops, so I tend to think that it is real. Hope Xipe Totec sees this and can fill us in more extensively.