Source: https://www.washingtonpost.com/blogs/rig...

Unless emergency conditions require consideration of a modest increase, we would strongly favor a freeze at the level of roughly ten thousand U.S. troops through January 20. This approach would also allow your successor to assess the situation for herself or himself and make further adjustments accordingly. . . .

In the long-term struggle against violent extremists, the United States above all needs allies—not only to fight a common enemy, but also to create a positive vision for the peoples of the region. Today, aided by the bipartisan policies of the last two U.S. administrations, Afghans have established a democratic political system, moderately effective security forces, a much improved quality of life, and a vibrant civil society.

They warned, “If Afghanistan were to revert to the chaos of the 1990s, millions of refugees would again seek shelter in neighboring countries and overseas, dramatically intensifying the severe challenges already faced in Europe and beyond.” In essence, the experts urged Obama not to make matters worse for the next president:

As an interim measure, and with the NATO Warsaw summit as well as other key decision points still looming on your watch, we urge you to maintain the current U.S. troop strength in Afghanistan through the end of your term. Based on longstanding experience in the country as well as recent trips to Afghanistan by some of us, this step would be seen as a positive reaffirmation of America’s commitment to that nation, its people and its security. It would likely have helpful effects on refugee flows, the confidence of the Taliban, the morale of the Afghan military and Afghan people, the state of the Afghan economy and perhaps even the strategic assessments of some in Pakistan. Conversely, we are convinced that a reduction of our military and financial support over the coming months would negatively affect each of these.