Texas Ranger Michael Adcock holds an assault rifle found at the murder scene as he answers questions from defense attorney R. Shay Isham during the capital murder trial of former Marine Cpl. Eddie Ray Routh at the Erath County, Donald R. Jones Justice Center in Stephenville, Texas February 17, 2015. Routh, 27, of Lancaster, is charged with the 2013 deaths of former Navy SEAL Chris Kyle and his friend Chad Littlefield at a shooting range near Glen Rose, Texas. REUTERS/Mike Stone (UNITED STATES - Tags: CRIME LAW MILITARY)