Chattanooga slayings prompt state, federal changes on military members being armed in U.S.

Noah Hanson, left, and his grandmother, Carol Hanson, of Boulder City, NV, view the ongoing memorial in front of the Armed Forces Career Center on Lee Highway. "We are taking a trip across the country to visit as many state capitol cities as we can," Hanson said.

Shootings at military facilities:

* 2009 — Fort Hood, Texas: Nidal Malik Hasan, a U.S. Army major and psychiatrist, fatally shot 13 people and wounded more than 30 others. Hasan was sentenced to death by military court. While some U.S. lawmakers called it terrorism, the Department of Defense and federal law enforcement classified it as workplace violence.* 2009 — Little Rock, Ark: Abdulhakim Mujahid Muhammad, Memphis native and convert to Islam, fatally shot one soldier and wounded another at a military recruiting center. He was convicted on state murder charges.* 2013 — Washington, D.C.: Military contractor and former soldier Aaron Alexis shot and killed 12 people and wounded three others at the Washington Navy Yard before being killed by police.* 2013 — Millington, Tenn.: Upset over a poor work evaluation, Guardsman Amos Patton shot three superior officers at the National Guard recruiting center.