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The air force includes the 449th Helicopter Gunship Squadron (449 ΜΑΕ) – operating Aérospatiale SA-342L and Bell 206 and the 450th Helicopter Gunship Squadron (450 ME/P) – operating Mi-35P helicopters and the Britten-Norman BN-2B and Pilatus PC-9 fixed-wing aircraft. Current senior officers include Supreme Commander, Cypriot National Guard, Lt. General Stylianos Nasis, and Chief of Staff, Cypriot National Guard: Maj. General Michalis Flerianos.[citation needed] The Evangelos Florakis Naval Base explosion, which occurred on 11 July 2011, was the most deadly military accident ever recorded in Cyprus.

What date did the Evangelos Florakis Naval Base explosion occur?
11 July 2011