U.S. President Barack Obama resumes discussions on reassessing the U.S. strategy in Afghanistan, meeting with the Joint Chiefs of Staff, officials said.

The Joint Chiefs were to meet Friday with Obama to discuss the effect on the military if a large number of additional troops were deployed to Afghanistan, CNN reported.

"The president wants to get input from different services," White House spokesman Tommy Vietor said. "It's a chance to consult with uniformed military leadership as a part of his review."

At least two military executives have expressed concern about a proposed increase of U.S. forces in Afghanistan, CNN reported. The Army and Marine Corps have said such a move could make it more difficult to give troops promised time at home between overseas tours.

U.S. Army Gen. Stanley McChrystal, the top commander in Afghanistan, has called for an increase in troops and a shift in strategy, saying the U.S.-led effort would fail without the changes.