Zachary Gallegos, 23, stands guard outside the Armed Services Recruiting Center on Thursday in Sioux Falls, South Dakota. The Pentagon has asked such self-appointed "armed citizens" to leave, citing security concerns. Kevin Burbach/AP hide caption

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Kevin Burbach/AP

Members of the FBI Evidence Response Team investigate the shooting at the Armed Forces Career Center/National Guard Recruitment Office on July 17 in Chattanooga, Tenn. Since the shooting, armed civilians have begun trying to guard such centers. Joe Raedle/Getty Images hide caption

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Joe Raedle/Getty Images

This booking photo taken in April and released by the Hamilton County, Tenn., sheriff's office shows a man identified as Mohammod Youssuf Abdulazeez after being detained on suspicion of a driving offense. AP hide caption

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AP

This booking photo taken in April and released by the Hamilton County, Tenn., sheriff's office shows a man identified as Mohammod Youssuf Adbulazeez after being detained on suspicion of a driving offense. AP hide caption

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AP

Yusra Siddiqui, right, and Zoha Ahmad, who came with others from the Islamic Society of Greater Chattanooga to offer their support, pray during an interfaith vigil at Olivet Baptist Church held in remembrance of victims of Thursdays shootings. Doug Strickland/TNS/Landov hide caption

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Doug Strickland/TNS/Landov

A car tangled in fencing sits inside the gate at the Naval Operational Support Center and Marine Reserve Center Friday, a day after a gunman killed four U.S. Marines in Chattanooga, Tenn. John Bazemore/AP hide caption

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John Bazemore/AP

Caroline Dove holds a photo of Marine Corps Lance Cpl. Skip Wells, her boyfriend, at her home in Savannah, Ga., on Friday. Wells was among four Marines killed Thursday in Chattanooga, Tenn. Russ Bynum/AP hide caption

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Russ Bynum/AP

Marine Corps Identifies 4 Service Members Who Died In Chattanooga Attack

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Reserve Recruitment personnel stand outside a military recruiting center on Lee Highway in Chattanooga, Tenn., as the area is cordoned off with blue shell casing markers. Officials said two military facilities in Tennessee were attacked in shootings Thursday. Tim Barber/Chattanooga Times Free Press via AP hide caption

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Tim Barber/Chattanooga Times Free Press via AP