Koman was charged with being involved with the 1997 "post-modern coup".[3] Koman told the Ergenekon trials that he was aware of the existence of the JITEM Gendarmerie unit during his tenure, and that it was an unofficial association of Gendarmerie members, which he had banned.[3]
As a young officer he was rumored to have slapped Former Prime Minister Adnan Menderes in his cell during Yassıada trials