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The Air Force has taken down its profile on MySpace because of "concerns about associating the service with content that it deems inappropriate" (Air Force Times) . An official quote: "The danger with MySpace is we got to the point where we weren’t real comfortable with the potential for inappropriate content to be posted [on the page of] a friend of a friend." The profile was launched in late August. Here's another official quote from an article that came out when the MySpace page went live: "In order to reach young men and women today, we need to be in tune and engaged in their circles."
Anyway, the Marines are still up.