Claim: Colin Powell served in a group.
Evidence: During his military career , Powell also served as National Security Advisor -LRB- 1987 -- 1989 -RRB- , as Commander of the U.S. Army Forces Command -LRB- 1989 -RRB- and as Chairman of the Joint Chiefs of Staff -LRB- 1989 -- 1993 -RRB- , holding the latter position during the Persian Gulf War.