Military intelligence
Although assigned to the Army Reserve, the 140th Military intelligence Battalion was the organic military intelligence battalion of the 40th Infantry Division (Mechanized) of the California Army National Guard. The battalion's numerical designation followed U.S. Army custom of adding 100 to the supported infantry division's number; "see also": the 1st Infantry Division's former 101st Military Intelligence Battalion and the 4th Infantry Division's former 104th Military Intelligence Battalion; "cf": comparable battalions in armored divisions would have a number 500 greater than the division.