A farewell ceremony has been held at the Azerbaijani Defense Ministry's Training Center for the pilots of the Azerbaijani Air Force - Major Tabriz Musazade, Major Urfan Valizade, Senior Lieutenant Bakir Ismayilov and Lieutenant Colonel Murad Mirzayev, who lost their lives as a Mi-24 helicopter was downed by the Armenian military units in the recent escalation of violence of the line of contact between the Armenian and Azerbaijani troops.