He would have done in a more controlled manner, and slow down if necessary - not let it get to this point where it's a total takeover by the Taliban while Biden is vacationing.
He was also the first president in 40 years to NOT start a war.
In the US, wars are started by Congress, not the President. The conflicts I listed are the only wars authorized by Congress over the last 40 years. We can bring other conflicts into the discussion, but that’s a different standard than “war”.