Kaiser Alexander Regiment. Napoleon beat the pants off the Prussians in 1806 and they reorganized their army with six grenadier battalions left. After Napoleon was defeated in 1814-ish the Prussian King Frederick William formed his grenadiers into two regiments named Kaiser Alexander and Kaiser Franz in honor of the two emperors (Russia and Austria) who fought with him to defeat Napoleon. I believe the regiments were part of the German Guards Corps by the time the 71/84 was adopted.
Turning relics into near-relics since 2005.