article_snippet: And that's a breakthrough.
article_snippet: Allen Allen has said Allen long fascination with World War II history was inspired by Allen father's service in the U.S. Army.
article_snippet: That moment of discovery was exhilarating," Kraft said.
article_snippet: CNN's Euan McKirdy, Jethro Mullen, Yoko Wakatsuki and Brad Lendon contributed to this report.