What is the blue and white pin worn on the breast of General Petraeus?

The blue and white pin worn by General David Petraeus on his breast is a symbol of the U.S. Army's Distinguished Service Medal, which recognizes exceptionally meritorious service to the U.S. Army. It signifies his notable contributions and leadership during his military career, particularly during the Iraq War. The pin serves as a mark of honor and accomplishment within the military community.