Donald Perera
Air Chief Marshal G Donald Perera Vishista Seva Vibhushanaya, VSV, Uttama Seva Padakkama, USP is a Sri Lanka air officer who served as Commander of the Air Force (Sri Lanka), commander of the Air Force from 2002 to 2006 and Chief of the Defence Staff (Sri Lanka), Chief of the Defence Staff from 2006 to 2009. He served as Sri Lankan Ambassador to Israel. Early life and education Perera was educated at S. Thomas' College, Mount Lavinia. SLAF career Perera joined the Sri Lanka Air Force as an officer cadet in the general duties pilot branch in the officer cadet intake 1 of the Air Force Academy, China Bay on 12 January 1972. On completing his flying training he was commissioned as a pilot officer on 19 October 1973. Serving as a squadron pilot in the No. 2 Squadron SLAF, he logged over 7,500 flying hours on transports. He served as the Commandant Flying Training Wing, Air Force Academy, China Bay; Commanding officer, the No. 2 Squadron; Base Commander, SLAF Katunayake and Zonal Comman ...
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Air Chief Marshal Donald Perera
The atmosphere of Earth is the layer of gases, known collectively as air, retained by Earth's gravity that surrounds the planet and forms its planetary atmosphere. The atmosphere of Earth protects life on Earth by creating pressure allowing for liquid water to exist on the Earth's surface, absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night (the diurnal temperature variation). By mole fraction (i.e., by number of molecules), dry air contains 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.04%