The 240th Signal Battalion Distinctive Unit Insignia (DUI), also referred to as a unit crest, was approved on 23 April 1976. A lion in the base of the shield portion of the insignia is adapted from the coat of arms of Normandy, the province where elements of the Battalion’s lineage served in five campaigns taking them from Normandy to Central Europe during World War II. The scarlet triangular area containing three stars commemorates the award of the Philippine Presidential Unit Citation to elements of the Battalion, with the stars denoting three campaigns in the Asiatic-Pacific Theater; the lower star has an Arrowhead attach to denote that the unit took part in an assault landing.
Also in the triangular area is a taeguk for wartime service in Korea; three flashes attached to it denote three awards of the Republic of Korea Presidential Unit Citation while also highlighting the unit’s service as a Signal organization. “Keystone Of Command” is the Battalion motto.
Interestingly, the 240th Signal Battalion was not constituted in the California Army National Guard until 28 December 1973, and when it was organized in January 1974 it was done so from existing Units in the Los Angeles area. So none of the campaign credits and military decorations referenced above were earned or won by any unit with “240th Signal Battalion” in its designation. Instead, they had already been earned by those existing units who brought them with them to their unit in 1974.
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The 240th Signal Battalion was most recently in the news during the COVID outbreak of 2020, when it was assigned to the California Army National Guard's Joint Task Force 115, a California-wide humanitarian response to the epidemic that among other things included assisting in the preparation and distribution of food boxes to citizens unable to leave their homes. As of Autumn 2023, however, the 240th Signal Battalion is not displayed anywhere on the California Army National Guard Web site and there is nothing to indicate that it remains an active unit.