Story highlights The U.S.'s top commander in Afghanistan said Thursday that "Afghanistan is at an inflection point"

He added that 2016 could be "no better and possibly worse than 2015" if adjustments are not made

Washington (CNN) The U.S.'s top commander in Afghanistan said Thursday that "Afghanistan is at an inflection point" and that 2016 could be "no better and possibly worse than 2015" if adjustments are not made.

In testimony before the Senate Armed Services Committee, Army Gen. John Campbell said, "Now, more than ever, the United States should not waver in Afghanistan."

President Barack Obama has previously announced that the U.S. will reduce its military footprint from 9,800 troops to 5,500 by the start of next year.

But Campbell warned the committee that "Afghanistan has not achieved an enduring level of security and stability that justifies a reduction of our support in 2016."

Campbell said that building up the Afghan military was "akin to building an airplane while in flight" and said a reduction to 5,500 troops would only allow for a "very limited" training mission.

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