[6] After graduating the United States Military Academy, Martin served as a tank platoon leader, scout platoon leader, and company executive officer in the 1st Battalion, 37th Armor Regiment, in the 1st Armored Division (1987 to 1990).

[7] Martin was assigned at the National Training Center and Fort Irwin in California as the Commanding General.

[8] He participated in Operation Iraqi Freedom as the commander of 1st Battalion of the 67th Armor Regiment in the 4th Infantry Division.

[14][15][16] In May 2018, Martin was nominated for promotion to lieutenant general and an assignment as the Director of the Army Staff.

[17][18][19] On 26 July 2019, he was assigned as the Army's 37th Vice Chief of Staff and promoted to general.