The leaflets, which are part of an information campaign to prevent people from joining the Islamic State, were dropped in a canister by an F-15 fighter jet last week.
"The message of this leaflet is: if you allow yourself to be recruited by Daesh, you will find yourself in a meat grinder. And it's not beneficial to your health," Pentagon spokesman Steve Warren said. Daesh is the Arabic acronym for the Islamic State group.
The leaflet shows a room with seven young men standing in a line under a sign that reads says Daesh Recruiting Office; a giant meat grinder labelled as Daesh and a sign in the corner says "Now serving 6001."
There is no united front against the Islamic State, which is contained by the government forces of Syria and Iraq, a US-led international coalition, as well as Iraqi and Syrian Kurds.
At least several thousand civilians have been killed in the violence, which also left hundreds of thousands more displaced.
The Islamic State's ranks in Syria and Iraq have repeatedly been replenished with citizens from more than 80 countries.