ADF air air-industry air-travel angles Australian-Defence-Forces blades defence exercises flight flying flyover formation height helicopter helicopters high manoeuvres military military-flyover perspectives rotors sky speed transport transportation travel traveling travelling acknowledgement ANZAC-memorials appearance Australian communication contemplation defence-forces historic historical history lest-we-forget light loss marble marble-memorial memorial memories painted peace raised reflection remembering remembrance reminder sadness shadows slogan smooth soldiers stonework sunlight sunshine symbol symbolic tribute wall war war-memorials World-War-! WWI barrier captured fence fencing foliage metal trees trench-mortar weapon weaponry wheel wheels World-War-I years basic dates metal-wrearth tarnish tarnished wreath