The statue in your photograph was done by Frederick Hart. It was eventually included in the memorial because many vets thought the wall was impersonal and did not depict the human element.
An interesting story about the sculpture is in a book of short stories by Thom Wolfe, "Hooking Up". In it he relates a meeting between Hart and Maya Lin, the designer of the wall. She asks Hart how he got the casts to make such beautiful and realistic sculptures. She thinks he had real people covered in plaster to form molds. He tells her he did not cast, but sculpted the figures, like someone would carve a decoy. She was disbelieving that anyone had the kind of talent and ability to achieve the realism of his work. No wonder. She designed and supervised and was declared a great artist for her work. Hart, despite being the most prolific of American sculptors is still not regarded highly in the "art" world, which is, of course, New York City. They still have never reviewed a piece of his work.