[Sean P Kelly]

Originally Posted by CaptHayfever

Channing Tatum as Duke? Again? Seriously? He keeps getting hired why?

And remember, "I'm-a Luigi, number one!"

Here's what Wikipedia has to say:

Channing Tatum as First Sergeant Conrad S. Hauser / Duke, the lead soldier. Lorenzo di Bonaventura wanted to cast Mark Wahlberg in the role. Tatum had played a soldier in Stop-Loss, a sensitively handled war film, and originally wanted no part in G.I. Joe, which he felt glorified war. Once he read the script though, he realized the franchise was a fantasy akin to X-Men, Mission: Impossible and Star Wars rather than a war film.

and

Joseph Gordon-Levitt as Cobra Commander, Destro's shadowy, masked boss. Levitt signed on because he was given pictures of Cobra Commander and decided it would be fun to play a larger than life villain. Levitt is a friend of Tatum and they co-starred in Stop-Loss. His casting provided extra incentive for Tatum to join the film. USA Today reported Levitt is playing "multiple roles".