Rear Adm. Mark Tidd escorts friends and family during a memorial for those killed during a shooting at the Navy Yard, at the Marine Barracks in Washington, D.C., Sept. 22, 2013. Twelve people were killed Sept. 18, 2013.

- Image ID: DEY30N
Rear Adm. Mark Tidd escorts friends and family during a memorial for those killed during a shooting at the Navy Yard, at the Marine Barracks in Washington, D.C., Sept. 22, 2013. Twelve people were killed Sept. 18, 2013.
MixPix / Alamy Stock Photo
Image ID: DEY30N
Rear Adm. Mark Tidd escorts friends and family during a memorial for those killed during a shooting at the Navy Yard, at the Marine Barracks in Washington, D.C., Sept. 22, 2013. Twelve people were killed Sept. 18, 2013.
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