NEW : President 's resignation is first in President 's history . Note : `` It was an honor for me to serve Germany as president , '' he said . Koehler had been criticized for comments on military 's role . He said they were inappropriate . Resignation was sudden and unexpected .
NEW : President 's resignation is first in President 's history . Note : Koehler had been criticized for comments on military 's role . He said they were inappropriate . Resignation was sudden and unexpected .