From the article (bolded text mine):
Meanwhile, a rising generation of young officers, who have become experts over the past nine years in the art of counterinsurgency, have begun quietly telling administration officials that they need time to get their work done.
“Their argument,” said one senior administration official, who would not speak for attribution about the internal policy discussions, “is that while we’ve been in Afghanistan for nine years, only in the past 12 months or so have we started doing this right, and we need to give it some time and think about what our long-term presence in Afghanistan should look like.”