Ten former defense secretaries said the election results are valid and Joe Biden won.
The Pentagon has endorsed a new slate of initiatives to expand diversity within the ranks and reduce prejudice.
One defense official described the situation to CNN as "scary" and "very unsettling."
The president's motives for the Pentagon shake-up are unclear, but it has created a great deal of unease within the building.
Three Trump allies stepped into new roles at the Defense Department, officials announced.
Democrats on Capitol Hill are calling Esper's ouster with two months remaining in Trump's administration reckless.
Acting Under Secretary of Defense for Policy James H. Anderson has submitted his resignation.
Miller is not among the most prominent national security names.
President Donald Trump has fired Defense Secretary Esper days after news outlets projected Trump would not win reelection....
Esper called his brief tenure as leader of the Pentagon "the honor and privilege of a lifetime."
The deadly riot in the U.S. Capitol on Jan. 6 attracted a variety of far-right extremists who shared a devotion to Trump.
The Humvee was stolen from a National Guard Armory in a Los Angeles suburb.
The proposal to expand military exchange shopping privileges had been expected to be finalized in late 2020.
Many survivors will see at least $400 more in their Feb. 1 annuity payments.
Typically, about half of each class washes out during the final apprentice course because of its demanding nature.