After two days of testimony by our military commanders on the Biden administration’s disastrous withdrawal from Afghanistan, here is what we have learned: Joe Biden is (as the president once termed a skeptical town hall attendee) “a lying, dog-faced pony soldier.” In an interview with ABC News’s George Stephanopoulos last month, Biden said none of his military advisers had recommended leaving a residual force of 2,500 troops in Afghanistan. But Gen. Mark A. Milley, chairman of the Joint Chiefs of Staff, and Gen. Kenneth F. McKenzie Jr., head of US Central Command, both testified that they had advised Biden —...