Work for preparation of the official visit of the Armenian defense minister Serge Sarkisian to the USA has begun. Ex-military attache of Armenia to the USA Hayk Kotanjyan is entrusted with the work. As "Mediamax" agency reports, Hayk Kotanjian will be appointed the minister councilor next week. The successor to Hayk Kotanjian will be Armen Sarkisian who filled the post of the head of the administration of the international military cooperation and foreign relations of the defense ministry.