The "Black Tyrones"
are a fictional Irish regiment mentioned in the poem "The Ballad of the Boh Da Thone" by Rudyard Kipling
It is presumably raised from County Tyrone in the Province of Ulster, the recruiting grounds of the real-life Royal Inniskilling Fusiliers and the later Royal Ulster Rifles.
The poem mentions their service in Burma (modern Myanmar) in pursuit of a prince-turned-robber named Da Thone and the vain efforts of Captain "Crook" O'Neil and his Black Tyrones to catch him. The regiment is also mentioned in Kipling's short stories Black Jack, The Courting of Dinah Shadd, The Incarnation of Krishna Mulvaney, Love-O'-Women, The Man Who Was and With the Main Guard.
In the 1975 film The Man Who Would Be King (based upon Kipling's writings) a character guarding the Khyber Pass, Private Mulvaney, is said to be "a loudmouth Mick from the Black Tyrones."