Although Trump has delegated authority for U.S. troop numbers in Afghanistan, the responsibility for America's wars and the men and women who fight in them rests on his shoulders. Trump has inherited America's longest conflict with no clear endpoint or a defined strategy for American success, though U.S. troop levels are far lower than they were under Presidents Barack Obama and George W. Bush. In 2009, Obama authorized a surge of 30,000 troops into Afghanistan, bringing the total there to more than 100,000, before drawing down over the rest of his presidency.