In 1989 , he became the commanding general of the 6th United States Army and Presidio of San Francisco .
Harrison was promoted to LTG and became the commander of I Corps and Fort Lewis until 1989 .
In 1989 , Harrison became the commanding general of the 6th United States Army and Presidio of San Francisco .
Harrison was promoted to LTG and became the commander of I Corps and Fort Lewis until 1989 .