Ancestry's UK & Ireland collection has seen the addition of indexes to four British military record-sets, as below. In each case, the original material is held by The National Archives in Kew, London.
UK, Military Deserters, 1812-1927: This index comprises nearly 303,000 entries extracted from lists of deserters published in the UK Police Gazette in 44 of the years between 1812 and 1827. Ancestry already holds these publications in a 'browse' collection, so researchers can search this new index for an individual record, note the publication date, and then browse to the full entry in the relevant edition.
UK, Royal Air Force Muster Roll, 1918This index holds some 195,000 records listing individuals by service number. It encompasses the RAF muster roll at the time of its creation on 1 April 1918. Images are available at Fold 3.
Naval and Military Courts Martial Registers, 1806-1930This index of more than 838,000 records contains various UK naval and military courts martial registers, including records from Naval, Field General, Military, District and General Courts covering the years 1806-1930 (see linked page for details of these courts and their registers). While there are inevitably many Irishmen recorded within the collection, the records also include nearly 500 court martials that took place in Ireland. Images are available at Fold 3.
British Army Lists, 1882-1962: This huge index holds nearly 2.5million records of individuals in the British Army. It doesn't include all possible years, but it is complete for the years spanning the 20th century's two World Wars. Images are available at Fold 3.