"The Royal Flying Corps on the Western Front, 1914-1918" A flight of five Royal Aircraft Factory S.E.5A scouts of No. 1 Squadron flying from St Omer aerodrome in formation, 21 June 1918. In the background by the hangar on the right can be seen the remains of a "crash" when a Royal Aircraft Factory S.E.5 of No. 1 crashed into a Royal Aircraft Factory R.E.8 of No. 53 Squadron. The Royal Aircraft Factory S.E.5 pilot was killed and the machine burnt, and the Royal Aircraft Factory R.E.8 was destroyed.