Not the man mentioned, but there may be a link, as this first man is also a Surgeon:
Google Obituaries
Lt Colonel Mathew, Robert Charles McWatters. M.B; F.R.C.S; I.M.S(Ret.). A former professor of surgery at Lucknow university, died on 18th June at Downton, Wiltshire; he was 95.
He was the son of David McWatters of Bath, was born in that city on 4th January 1878.
Served NW Frontier, WWI, with the Indian army in France 1914 - 1916, 1919 Afgan campaign, WWII in RAMC for duration, age 60.
Might be related to William above, with the Indian connection.
Another link may be the following:
Capt Gearge McWatters, he was born on 17th March, 1922 in India, the son of Lt Colonel George Alfred McWatters, who was of Northern Irish decent and had seen active service with the 81st Pioneers on the North West Frontier in 1897 - 98 and subsequently commanded the 10th battalion, 1st Madras Pioneers.
Capt G McWatters, the son, during the sixties established a television company, which by the late 1980s had become Harlech Television.
Looks as if the whole family is in India.
Another:
Myherritage
No military indicated
John Alexander McWatters was born on month, day, 1862, in birth place, to William Alexander McWatters and Ellen McWatters (B. McKee). William was born circa 1832, in Newtownards, county Down, Ireland.
Ellen was born circa 1832, in county Down, Ireland.
John had 4 brothers: Hugh Andrew McWatters and 3 other siblings. John married Mitylene Irvine McWatters (B.Goodwin) on day, month, 1885 at age 22 in marriage place.
Mitylene was born May 19, 1866 in Marborough, Queensland, Australia. They had 7 children : Mitylene Irwin Patrick (B. McWatters), Ellen Chant (B. McWatters and 5 other children.
John then married Annie McWatters (B. Flannigan) on day, month, 1905, age 43, in marriage place. Annie was born on September 26th 1869 in Newry, county Down, Ireland.
They had 2 daughters: Vera Mary Hinde (B. McWatters) and one other child.
His occupation was a occupation. John passed away on day, month, 1929 at age 67 in death place. He was buried in burial place.
There are many more to be found in Australia and the USA.
Eddie