Chief Master Sgt. James Seballes served as the Senior Enlisted Leader, Space Training and Readiness Command (STARCOM), temporarily located at Peterson Space Force Base, Colorado. STARCOM was established as a Field Command 23 August 2021.  The command is responsible for preparing, developing, and delivering more than 8,600 Guardians to enable the United States Space Force to prevail in competition and conflict through innovative education, training, doctrine, and test activities.

Chief Seballes grew up in Austin, Texas. He enlisted into the United States Air Force in  June 1994.