Pakistan’s army has sent home two-thirds of the U.S. military personnel who were training its forces in counterinsurgency skills along the porous border with Afghanistan.

“We have reassessed our requirements and sent 90 people home,” said the Pakistani military official. Other Americans have also been ordered to leave Pakistan, but the official would not elaborate or provide details.

“Where essential elements are required we are keeping them. In very critical areas of maintenance and technical capability, where we do not have the qualified people then we are keeping them,” he said. “But otherwise they are being asked to leave.”