9. In addition, the above officers should be informed that the matter is of the utmost secrecy and must not be discussed below their level; and that the fullest investigations and countermeasures are in train. Above all they should not conduct any independent enquiries, as this will lead to confusion. It should also be stressed to them that there is a propaganda aspect in that the secret weapon story is one of the principal methods by which German morale at home and at the front is being maintained.