 For the Air Forces, the Royal Naval Air Service and the Royal Flying Corps which were amalgamated into the new Royal Air Force on 1 April 1918, eligibility was broadly the same as for the British Army.It required overseas service, but members of the Air Forces who had seen combat whilst based in the United Kingdom, who had ferried aircraft to France or who had served on ships carrying aircraft were eligible for the award of the medal.Merchant seamen qualified for the British War Medal in addition to the Mercantile Marine War Medal if they served at sea for not less than six months between 5 August 1914 and 11 November 1918, or had undertaken one or more voyages through a danger zone.