A member of the Secret Service counter sniper team walks on a roof as US President Barack Obama speaks during a memorial service at the Marine Barracks September 22, 2013 in Washington, DC for victims of the September 16, 2013 shooting at the Washington Navy Yard that took the lives of 12 people. A FP PHOTO/Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)