ROCKHAMPTON, AUSTRALIA - JULY 31:  Seen are spent ammunition bullet casings laying on the ground during a live fire excercise on July 31, 2013 near Rockhampton, Australia. Over 30,000 US and Australian troops are participating in Talisman Sabre, a biennial excercise that enhances multicultural collabration between U.S and Australian forces for future combined operations, humanitarian assistance and natural disaster response.  (Photo by Ian Hitchcock/Getty Images)
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