What nationality were the Berlin Wall guards?

The guards at the Berlin Wall were primarily East German, as they were members of the Nationale Volksarmee (National People's Army) and the Grenztruppen der DDR (Border Troops of the German Democratic Republic). Their role was to prevent East Germans from defecting to the West, and they were tasked with enforcing the strict border regulations imposed by the East German government. Some guards were also part of other East German security organizations.