Lots of people are misreading this, believing that this is something new, and suggesting that both were either pushed out, or are doing this in response to all of the Snowden revelations. That‘s simply not true. Alexander‘s retirement has been widely reported since at least June (and has been covered in a number of other publications as well). Both retirements were planned long ago, and appear to be exactly on schedule, rather than as any reaction to things happening in the news.