Reserve Officer Training Corps
It trains officer for duty in the Army. Upon graduation from
Army ROTC, you will earn the bar of a Second Lieutenant and be
commissioned into the Active Army, Army Reserve or Army National
Guard. The other branches have their own types:
NROTC is Naval Reserve Officer Training Corps, which provides
both Navy and Marine Corps Reserve Officers.
AFROTC is Air Force Reserve Officer Training Crops.
NJROTC is Naval Junior Reserve Officer Training Corps, which
provides both Navy and Marine Corps Reserve Officers.
MCROTC Marine Corps Reserve Officers Training Corps
(If you put a "J" it means junior which is high school ROTC)