Hand of an Unknown soldier

While waiting for the traffic light to turn green, I noticed this army truck about two cars ahead, full of young men in uniform. As we inched our way forward and got right next to them, I saw this soldier's hand. I instantly pulled out my camera and my husband, as if by instinct, rolls down his window to allow me to take this one shot.
I think of the lives these men protect, save and defend. I wonder about the young soldier whose hand this belongs to and I feel a certain sadness.