There is another McKissick who fought in the Revolutionary War that was not on your list.
James McKissick was in the 8th Pennsylvania Regiment, Miller's Company."These regiments from the frontier counties of the State, Westmoreland and Northumberland, were the first of the Line in the field, though they had come from the banks of the Monongahela and the headwaters of the Susquehanna."History of Fayette County, by Franklin Ellis, Philadelphia, L H Everts and Company, 1882, p77.
Maryland Pension Roll 1835 JAMES McKISSICK WASHINGTON COUNTY PRIVATE PENNSYLVANIA LINE $96.00 ANNUAL ALLOWANCE $834.13 AMOUNT RECEIVED OCTOBER 31, 1818 PENSION STARTED AGE 66 DIED DECEMBER 23, 1826