by using special methods of dropping birds, including experiments with containers and aids for the preservation of the birds in small containers. Security Service 6. The Security Service are not direct users of pigeons but are concerned with developments for the use of carrier pigeons by the enemy in order that counter measures can be considered. Air Intelligence 7. Requirements for Air Intelligence for carrier pigeons in war are similar to those of Military Intelligence, except that it will not be necessary to use so many birds.