Washington ? President Barack Obama’s national security adviser did not rule out adding more U.S. forces in Afghanistan to help turn around a war that he said on Sunday is not now in crisis.

James Jones, a retired Marine general with experience in Afghanistan, said the United States will know “by the end of next year” whether the new war plan Obama announced in March is taking hold.

The administration is redefining how it will measure progress, with new benchmarks that reflect a redrawn strategy. An outline is expected next month.

Making the rounds of the Sunday talk shows, Jones did little to dispel the growing expectation that Obama soon will be asked to supplement the 21,000 additional forces he already approved for Afghanistan this year.

“We won’t rule anything out,” but the new strategy is too fresh for a full evaluation, Jones said.

“If things come up where we need to adjust one way or the other, and it involves troops or it involves more incentives … for economic development or better assistance to help the Afghan government function, we’ll do that.”

The Obama plan is supposed to combine a more vigorous military campaign against the Taliban with a commitment to protect Afghan civilians and starve the insurgents of sanctuary and popular support. It envisions a large development effort led by civilians, which has not fully happened, and a rapid expansion of the Afghan armed forces to eventually take over responsibility for security.