I saw this point over at Blue sky: if you want to know how pissed people in the military are, look at how long it takes for the info to leak.
In this case, the slide decks are dated April 29 or 30. They leaked on May 1. So it only took one or two days for someone to get pissed off enough to put their career on the line go to the press, for the press to get the story together, and to find enough other corroborating sources (also probably pissed off) to publish the story.