'Overheard' @ SXSW: What does green mean to you?

I didn't actually need to hear anything to get the story here. The interview crew were wearing shirts featuring the title question (which I really thought would show up in the picture, but just trust me), and they cornered this Spartan from the 405th Infantry Division. What does green mean to you, guy dressed like the Master Chief?

I felt very lucky to witness this convergence. Such a perfect meeting is like a lol-ar eclipse.