I have found John McTyre's enlistment for the Revolutionary War. March 24, 1777 under Capt Anthony Singleton Co of Artillery Col Charles Harrison.
He was discharged Aug 30, 1777. Was he Robert McTyre's line?
Frizzle McTyre or McTear enlisted Dec 20, 1776 for three years
William McTyre or McTyere enlisted Sept 9, 1778 for three years. They were also under Col. Charles Harrison.