The Indian Air Force is celebrating its 85th Air Force Day with a large parade. A series of air displays will be organised at the Hindon air base near Delhi. The day is being observed in the shadow of the helicopter crash in Arunachal Pradesh on Friday that killed seven military personnel on board. Air Chief Marshal BS Dhanoa is likely to refer to this loss when he addresses his air warriors later this morning. The Mi-17 V5 chopper was on an air maintenance mission at an altitude of 17,000 feet when it crashed, according to the Air Force. The helicopter was flying to Yangtse to drop off kerosene jerry cans at an Army camp. Those who died included to a Wing Commander and a Squadron Leader.