Per Wikipedia:
James Norman Mattis (born September 8, 1950) is a retired United States Marine Corps four-star general who served as the 26th US secretary of defense from 2017 to 2019. During his 44 years in the Marine Corps, he commanded forces in the Persian Gulf War, the War in Afghanistan, and the Iraq War.
Yea, got him mixed up with the Milley. My mistake.