WASHINGTON — After four decades in uniform, chairman of the Joint Chiefs of Staff Gen. CQ Brown was unceremoniously ushered from his post nearly two-and-a-half years early tonight via a social media message by President Donald Trump.His unprecedented replacement: John Caine, a retired three-star Air Force officer.“I want to thank General Charles “CQ” Brown for his over 40 years of service to our country, including as our current Chairman of the Joint Chiefs of Staff,” Trump wrote in a post on Truth Social. “He is a fine gentleman and an outstanding leader, and I wish a great future for him...