Way back in the "Surge" days (2007-2008), we used to do this type of "media assessment" of news coverage of Iraq, but it was mostly for situational awareness for the brass and PAO types, and wasn't meant to ban embeds. From Stars & Stripes:
Rendon examines individual reporters’ recent work and determines whether the coverage was “positive,” “negative” or “neutral” compared to mission objectives, according to Rendon officials. It conducts similar analysis of general reporting trends about the war for the military and has been contracted for such work since 2005, according to the company.While senior leadership in the military want the press to write great stories about how everything is going swell, the same leaders generally understand there's something called the first amendment, and the military is obligated as a public organization to provide truthful information. If this type of vetting had anything to do with Michael Yon getting his embed canceled, someone's really fucking up. Maybe J is onto something?
“We have not denied access to anyone because of what may or may not come out of their biography,” said Air Force Capt. Elizabeth Mathias, a public affairs officer with U.S. Forces Afghanistan in Kabul. “It’s so we know with whom we’re working.”
U.S. Army officials in Iraq engaged in a similar vetting practice two months ago, when they barred a Stars and Stripes reporter from embedding with a unit of the 1st Cavalry Division because the reporter “refused to highlight” good news that military commanders wanted to emphasize.