ATS Signal Operators WWIIOriginal vintage World War Two poster ATS as signal operators Day and night at home and abroad, ATS operators send and receive messages, swiftly, accurately featuring a photomontage design showing ATS workers in uniform using radio equipment in front of a squared graph paper style background, the title in bold lettering above and diagonally in white, and on the margin with the ATS below. The ATS (Auxiliary Territorial Service, 1938 1949) was the