William Whistler-- Part 1: Over 60 Years in U.S. Army

From Wikipedia.

John Whistler's son, who accompanied him to Fort Dearborn, was born in 1780 and died in 1863.

He was commissioned 2nd lieutenant in the 1st U.S. Infantry in June 1801 and promoted to 1st lieutenant in 1807 and captain in December 1812.

When the Army reorganized after the War of 1812, the 1st Infantry was redesignated the 3rd Infantry.

Brevetted to major in 1822 and served ten years at that rank.  In April 1826 he was assigned to the 2nd U.S. Infantry and became lieutenant colonel of the 7th Infantry in July 1834.

Colonel of the 4th U.S. Infantry July 1845.  Retired April 1861 and died December 4, 1863.

--Brock-Perry