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McChrystal's PR man resigns, how Rolling Stone got more access

A senior military official tells NBC News that Duncan Boothby, a civilian on Gen. McChrystal's public relations staff who was apparently responsible for setting up the Rolling Stone interview, has resigned.

The official adds, however, that it appears Boothby was "asked to resign."

In addition, NBC spoke to Michael Hastings, the author of the Rolling Stone profile on McChrystal. He's in Afghanistan on an embed with the U.S. military now, and he's just learning the details about the impact his article is having.

Hastings says he stumbled onto unprecedented access with McChrystal. After McChrystal's press advisers accepted a request for the profile, Hastings joined McChrystal and his team in Paris. It was supposed to be a two-day visit, followed up with more time in Afghanistan.

The volcano in Iceland, however, changed those plans. As the ash disrupted air travel, Hastings ended up being "stuck" with McChrystal and his team for 10 days in Paris and Berlin. McChrystal had to get to Berlin by bus. Hastings says McChrystal and his aides were drinking on the road trip "the whole way."

"They let loose," he said. "I don't blame them; they have a hard job."

Hastings then traveled with McChrystal in Afghanistan for more time. What was supposed to be a two-day visit, turned into a month, in part due to disruptions of the volcano.

Hastings says McChrystal was very "candid" with him and knew their conversations were for reporting purposes. "Most of the time I had a tape recorder in his face or a notebook in my hand," he said.

Hastings says most of the critical comments, which are now causing a stir, were said in the first 24 hours or so. "It wasn't a case of charming him into anything," Hastings said.