Shown above: a message written on rice paper is put into a container and attached to a pigeon by members of 61st Division Signals at Ballymena, Northern Ireland, July 3, 1941. More pigeons can be seen in baskets behind them. Photo purchased from Imperial War Museum Collection; originally from War Office Second World War Official Collection.
(c) Crown copyright images reproduced by courtesy of The National Archives, London, UK
Catalog numbers AIR2/4129 #185, #195, #196
The minute sheet outlines the plan for the pigeon, including the codes. Sid Moon supplied pigeons for the Special Service.
Also below is correspondence from 1942 about the use of pigeons by A.I. 1 ( c ), the Air Intelligence component of M.I.6, the Secret Intelligence Service. Documents exceed the frame for ease of reading.