During the Falkland´s war, some combat rations box had in their pamphlets inside as having been packaged by "Argentine hands," demonstrating the support of the civilian population to war.
I want to know if this kind of messages can be considered as part of psychological warfare and if there were similar cases of delivery leaflets "in hand" in others conflicts.
The military, long pressed by leftists, began a sincere campaign of psychological warfare directed at all sectors, including the military, in 1968 with their manual - RC 5-2 Operaciones Sicológicas
This continued in earnest during the "Dirty War," 1977 - RE 9-51 Lucha contra elementos subversivos
These are available for download in Spanish at:http://www.ruinasdigitales.com/documentos-dictadura-militar/
If you don't speak Spanish I can send you my notes in English.
This psychological campaign had its origins in the French school of COIN. Furthermore, the nationalism of the Junta was especially focused on soldiers, the notes in the rations were most likely placed there upon government orders... even if they were, they can be seen as at least a by-product of years of nationalism and remember that the flow of nationalist sentiment is not a one way street.