Turkey’s air force in September made a public appeal to hundreds of former pilots to return to its depleted ranks to replace more than 350 airmen purged after July’s failed coup.

The call has largely gone unanswered, according to military officials and former pilots, as the deep divisions exposed by the coup attempt in Turkey’s military and other institutions remain unhealed.

Six pilots who left the air force over the past decade and would be eligible to return spoke to Reuters. Only one said he would re-register to help replace dismissed colleagues whom the government blames for being part of a network that planned the failed July 15 coup.

Air force pilots played a major role in the abortive putsch, commandeering jets and helicopters that bombed parliament and threatened the aircraft of President Tayyip Erdogan.