"For the past two years, U.S. military leaders have been using Iraqi media and other outlets in Baghdad to publicize Zarqawi’s role in the insurgency. The documents explicitly list the "U.S. Home Audience" as one of the targets of a broader propaganda campaign." Tom Ricks
The disastrous war in Vietnam or more properly in what used to be called Indochina, led to many strange twists and turns in the development of American institutions.
The Army fought well in Indochina. It won all the big fights. It won nearly all of the smaller fights. The counter-insurgency doctrine eventually applied experience considerable success, but we lost the war. The communists control Vietnam in spite of all that pain, all that death.
Not surprisingly, the military (especially the Army) tried, in its unhappiness, to explain its defeat to itself. The issue of institutional failure was examined for years and years and lessons were learned for good or ill. One of the big "lessons" learned was a renewal of the "stab in the back" theorizing that always follows the defeat of an army that survives the defeat. In this case, the belief grew up that the war had been lost in the United States itself through the "betrayal" of the cause by the media. As a result, the armed forces focused on the value of what is now called "Information Operations" to control that aspect of the "battle space." The "battle space" is now conceived of as extending to the United States as a legitimate area of operations for conducting "Information Operations (propaganda) to maintain US citizen support for the war effort.
In this article by Ricks we have a documented example of the authorized planning for such an effort conducted in both the the US Homeland and in the theater of active COMBAT operations. COMBAT operations are now referred to in armed forces doctrine as "kinetic" operations in order to distinguish such operations from "Information Operations" and operations in cyber-space.
I attach an early paper written and published by advocates of such an approach to warfare.