This is no surprise - and Sweeney was part of the cabal around Mattis that wound up slowing down @realDonaldTrump policy implimentation: Pentagon chief of staff Kevin Sweeney resigns
Kevin Sweeney has resigned as Pentagon chief of staff after serving the defense secretary for two years.
"I've decided the time is right to return to the private sector. It has been an honor to serve again alongside the men and women of the Department of Defense," Sweeney said in a short statement posted on the Department of Defense website late Saturday night.
A knowledgeable source told CNN's Jake Tapper that the White House forced Sweeney out. The source did not provide further information about the reason. more... https://www.cnn.com/2019/01/06/politics/kevin-sweeney-resigns/index.html