Four years active and four years reserve (as a cadet, while in college).
Left after four years active duty as as a First Lieutenant promotable and honor grad of my Signal Officer Advanced course when they wanted to send me to Ft Polk, LA, (No thanks)
I was a Signal Platoon leader and then the Company XO, not to mention the Battalion Training Officer, all part of 38th Signal Battalion, supporting the 56th Field Artillery Command (Pershing-II Missles) until spring of 1991 when the unit was deactivated in accordance with the INF treaty.
FWIW,
TB