With Yemen in turmoil and its government splintering apart, the Defense Department has lost its ability to monitor the whereabouts of U.S.-donated small arms, ammunition, night-vision goggles, patrol boats, vehicles and other supplies. The situation has grown worse since the United States closed its embassy in Sanaa, the capital, last month and withdrew many of its military advisers.
In recent weeks, members of Congress have held closed-door meetings with U.S. military officials to press for an accounting of the arms and equipment. Pentagon officials have said they have little information to go on and that there is little they can do at this point to prevent the weapons and gear from falling into the wrong hands.
"We have to assume it's completely compromised and gone," said a legislative aide on Capitol Hill, who spoke on the condition of anonymity because of the sensitivity of the matter.
U.S. military officials declined to comment for the record. A defense official, speaking on the condition of anonymity under ground rules set by the Pentagon, said there was no hard evidence that U.S. arms or equipment had been looted or confiscated. But the official acknowledged that the Pentagon had lost track of the items.