Mark Milley received a directive from Trump in Nov 2020 for US troop withdrawals from Somalia and Afghanistan.
The directive, signed by Trump, mandated complete US withdrawal from Afghanistan by Jan 15, 2021.
Milley later received an order from Robert O'Brien to reduce troop presence to 2500.
Milley didn't disclose the source of the directive for total withdrawal during testimony.
Despite the transition, Biden proceeded with troop withdrawal from Afghanistan.
Milley and Gen. McKenzie testified before the House Foreign Affairs Committee, their first appearances since retirement.
Pro-Trump Republicans' blame game overlooked the nuances of the withdrawal plan.