The Office of Strategic Influence, or OSI, was believed to have been closed due to the negative publicity received after it was announced by Donald Rumsfeld.
"[Doug Feith] indicated to me that he has decided to close down the Office of Strategic Influence. [...] So it's being closed down." - Secretary of Defense Donald Rumsfeld, 2002-02-26 [1] (http://www.defenselink.mil/news/Feb2002/t02262002_t0226sd.html)
The OSI would have been a center for the creation of propaganda materials, for the stated purpose of misleading enemy forces or their civilian populations.
Some argue that due to its nature and stated purpose, the (non-)existence of such an agency would be hard to determine.
"And then there was the office of strategic influence. [...] I went down that next day and said fine, if you want to savage this thing fine I'll give you the corpse. There's the name. You can have the name, but I'm gonna keep doing every single thing that needs to be done and I have." - Secretary of Defense Donald Rumsfeld, 2002-11-18 [2] (http://www.defenselink.mil/news/Nov2002/t11212002_t1118sd2.html)
Compare with Black Ops[?]
