 For the Royal Navy, Royal Marines and the Dominion and Colonial naval forces, the criteria were 28 days mobilised service, without a requirement for overseas service.The medal was presented to the next-of-kin of all casualties, including those who were killed before the completion of this 28 days period.The medal was also awarded, with the same criteria, to members of the Women's Royal Naval Service, to members of Queen Alexandra's Royal Naval Nursing Service and Royal Naval Nursing Service Reserve, and to a number of non-Naval personnel who served on Royal Navy ships, such as canteen and medical staff.