LONDON (Reuter) - A duck that cannot swim has become an honorary flight lieutenant at a British air force station and been outfitted with a life jacket. The June edition of the Ministry of Defence`s house journal reports that Jemima was found by airmen in the emergency water supply lagoon at the Royal Air Force`s Marham base in eastern England. Suffering from a deficiency of oil in her feathers, she was paddling furiously in an attempt to keep afloat. The Aylesbury duck, which has now become a station mascot, is pictured wearing a bright red inflatable life jacket, designed to ensure she keeps her head above water.