|Affiliated||Walmington-on-Sea Home Guard|
|First Seen||The Man and the Hour|
In The Man and the Hour, upon hearing word of Anthony Eden's announcement of the formation of the Local Defence Volunteers, Desmond went to St. Aldhem's Church hall and signed up to his local platoon, commanded by Captain Mainwaring.
In Sons of the Sea, he is picked as one of the men to crew the platoon's first river patrol. They end up believing that they are lost in the English Channel, then have landed in occupied France - only to find that they had only drifted out to sea a short way, then down the coast a few miles.
In A. Wilson (Manager)?, Desmond is (along with the rest of the platoon, aside from Private Pike) accidentally led to believe that he has been promoted to sergeant for a short time, after Pike mis-interpreted Mainwaring's orders. Desmond's reaction, along with that of many of Sponge's section, is that there must've been some sort of mistake.