Australian Defence Force Lt. Col. Eric Stevenson, center, the joint and combined umpire liaison officer to Forces Command, orients U.S. Army Lt. Brandon Thomann, left, a scout cavalry officer assigned to the 25th Infantry Division, and U.S. Army Capt. Kathryn Walker, an engineer assigned to U.S. Army Pacific Command, Hawaii, to techniques for adjudicating battlefield engagements and determining personnel and equipment casualties as umpires for Talisman Sabre 2011 June 16, 2011, at Camp Growl in Queensland, Australia. Talisman Sabre is a combined biennial exercise between the U.S. and Australian militaries designed to enhance both nations ability to respond to regional contingencies.