Chesty is a bulldog who serves as the official mascot of the United States Marine Corps. He's named for Lt. Gen. Lewis "Chesty" Puller (1898-1971).* This particular bulldog is the sixteenth to bear the title of Chesty when the Marine Corps adopted its first bulldog for this purpose in 1957.
This video shows how Chesty is trained and kitted out to serve the corps and engage in his work for it. Although there are treats involved, Chesty also has responsibilities and standards to uphold.
-via Instapundit
*I enthusiastically recommend the Pulitzer Prize-winning autobiography of Chesty Puller's son. It's a raw, honest, and moving story of the full life of a man in all its ordeals.
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