Prof.Dr. Gamal Sosa, BU president congratulates his Excellency Mr. president/ Abdel Fattah EL-Sisi, the head of the state the general/ Mohamed Ahmed Zaki, the minister of defense and the military production, the general/ Osama Rushdie Asker, the Army chief of staff and the staff Brigadier general/ Fahmy Heakal, the secretary-general of the ministry of defense and the military leaders on the occasion of Sinai liberation day.