What in your opinion is the most effective type of propaganda?

Bandwagon: We are herding animals and crowds draw us in. Remember Mama asking you, "Well, if ___ did it, would you?" Hell yeah! And it doesn't end when you outgrow your teenage years. This is why so much effort is put into using celebrities to shill for politicians. To rig polls to show desired results. Get on the bandwagon...

Hands down... the American Media.

Worse than the media controlled by the State Parties (DPRK, Communist Regimes, Socialist Latin American Countries, etc.).

In the case of RP, I'd say it's the Plants here that perpetuate the Social Experimentation going on in the Military.