It's hard to tell just where retired General Mark Milley's portrait once hung in the Pentagon's prestigious E-ring hallway, alongside all of the former chairmen of the Joint Chiefs of Staff.

The Pentagon on Monday removed the portrait of Mark Milley, the retired Army general and former chairman of the Joint Chiefs of Staff, according to two Reuters witnesses, in a move that happened within two hours of President Donald Trump's inauguration.

Mark Milley's portrait as chairman of the Joint Chiefs of Staff was taken down from the Pentagon hallway where all of the paintings of the previous chairmen are located.