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On 4 January 2005, Troop B 1/104 Cavalry, augmented with platoons from A and C Troops and teams from the 104th Long Range Surveillance Detachment were mustered into Federal Service as part of the 2nd Brigade Combat Team, 28th Infantry Division, and served in ar Ramadi, Iraq from July 2005 to July 2006 attached to the 2nd Marine Division and then the 1st Marine Expeditionary Force.
Throughout the opening days of May 2009, soldiers flew into multiple forward operating bases across Iraq with the majority of the brigade based out of Tallil, Al Kut, and Basrah.
Commissioned in 1942 via the ROTC program at Texas A&M, Leonard was serving as a platoon leader in Company C, 893rd Tank Destroyer Battalion, which was attached in October 1944 to support the 112th Infantry Regiment of the 28th Infantry Division during that unit's assault on the Siegfried Line through the Hürtgen Forest area along the German-Belgian border.