Well, the WWI armistice and following that the veterans memorial don't give meaning - they were chosen that way because someone thought that the number had reason. Or perhaps because "Hey, if we make it one day later it Nov 11th - what if we make it at 11:11!"? Perhaps if the war had ended two months earlier it would have been Sept 9th at 09:09 ;)

But yes, Nov 11th is a date where lot of things happened, especially in German history.