Collecting insignia from the Federal Bureau of Investigation since 1999.
This site is not officially sanctioned by the Department of Justice, The Federal Bureau of Investigation, The Louisville Metro Police Department, or any of their entities.
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Operation Elm Tree was the name given to the security operation at the United States Prison in Terre Haute, Indiana for the execution of domestic terrorist Timothy McVeigh, who killed 168 people in the bombing of the Murrah Federal Building in Oklahoma City, Oklahoma on April 19, 1995.  This patch was made for the FBI portion of the detail.

Source:  Doug Runyon