He was the head of the US Army Forces Command at Fort Bragg, North Carolina, and was assigned to review the investigation of former Army Sgt. Bowe Bergdahl, who was held captive by the Taliban for five years after leaving his post in Afghanistan in 2009.
Mr. Trump re-nominated him in 2017 for a second term.
The date of transition has yet to be determined.
He commanded the 1st Battalion, 506th Infantry, 2nd Infantry Division; the 2nd Brigade, 10th Mountain Division; served as the Deputy Commanding General for the 101st Airborne (Air Assault); and served as the Commanding General for 10th Mountain Division.
James Comey to Testify Before House Committee
Comey, who spent Friday testifying before House lawmakers, told reporters his return visit will likely come the "week after next". Former FBI Director James Comey has arrived on Capitol Hill for a closed-door interview with two House committees.
Trump hinted earlier Friday that he would be making an announcement on Saturday, when he attends the game and is expected to perform the coin toss to decide which team gets the ball first.
Dunford was nominated to the post in 2015 by former US President Barack Obama.
Goldfein began his term as Air Force chief of staff in 2016, so wouldn't be expected to step down until the summer of 2020.
Milley has championed the rebuilding and expansion of the Army's force in recent years, warning of the need to prepare now to face major, urban combat operations against a near-peer rival such as Russian Federation or China. Those operations would have to be fought in an expeditionary manner and not from large forward operating bases or smaller semi-permanent outposts such as those US servicemembers have fought from in Afghanistan, Iraq and now in Syria.
Judge: Cardi B must not contact strip club melee victims
A judge issued two protection orders, meaning the rapper must not go near or contact the women, including on social media. In addition to her legal woes and GRAMMY noms, she also announced that she and husband Offset have called it quits.
In recent years, Milley has been on the forefront of change for the Army.
He also served as deputy commanding general of US forces in Afghanistan. Milley would succeed Marine General Joseph Dunford, who would normally stay in office as chairman until a slated October 1, 2019 handover date.
Millions of Lives could be saved by tackling Climate Change
But a cold winter and a hot summer both raised energy demands, contributing to an estimated 2.5 percent increase in emissions. The United States will account for 15% of Carbon dioxide pollution in 2018, an increase of about 2.5%.