Navy Corpsman, Christopher Duke, who is on leave from Afghanistan, adjusts his Batman mask while holding onto birthday balloons while waiting to surprise his kids, Brayden Duke, 3, and Brilee Duke, 1, on Sunday, June 1, 2014, in the Delbridge Museum of Natural History at the Great Plains Zoo in Sioux Falls. "I'd give anything for these two," Duke said about his kids, "I love them more than anything." Duke was dressed as Batman as a birthday surprise for his son's upcoming birthday.