MyHeritage is a family history site. Much like Ancestry, we normally need to subscribe in order to search its records.
In honour of Memorial Day in the US, they are offering free access to all military collections on MyHeritage, between 20 and 26 May 2020. These include over 57 million records, including some for the British military, including Royal Navy Ratings’ Service Records 1853-1928; British Soldiers Died in the Great War 1914-1919; Royal Marines Service Records 1842-1925, etc.
Some of these records are ultimately held at the UK National Archive, which is offering some downloadable records for free during its current period of closure.