An IET soldier placed in charge of a company as student leadership. There are also PGs which act as leadership on the platoon level, squad leaders, class leader, and possibly their assistants. The roles are used to teach student to manage themselves on smaller issues and leave the NCOs to handle larger issues. It also teaches students to use their chain of command correctly.
There could be a couple different answers to this question, depending on context.
If you're referring to a student who is involved in a cadet programme (it would have to be Army ROTC, JROTC, or an independent programme based on Army rank structure, as the Army is the only service with the rank of Sergeant First Class in the US), then it would be someone who holds the rank of Cadet Sergeant First Class, and would perform duties within their cadet unit as someone of equivalent rank would in an actual Army unit - platoon sergeant, staff NCO, etc.
If you're referring to someone who is actually in the Army, I can think of a couple explanations.
The first would be someone attending the Advanced Noncomissioned Officer Course, which is a requirement for personnel being promoted to Sergeant First Class.
The second would be Basic Training, where basic trainees will be delegated with roles such as squad leader and platoon sergeant.
YES
First Sergeant in both the Army and Marine Corps is E-8.
I am in JROTC (junior reserved officers in training corps) so I have to know... Private Private first class specialist or a corporal (I am a corporal) sergeant staff sergeant sergeant first class Master sergeant or first sergeant sergeant major command sergeant sergeant of the army
Master sergeant
A sergeant is an enlisted soldier higher in rank than a corporal or private, lower than such ranks as staff sergeant and first sergeant. In the U.S. Army a sergeant has pay grade E-5 and wears three stripes.
The first US Army Sergeant Major of hte Army was William O. Wooldridge.
YES
First Sergeant in both the Army and Marine Corps is E-8.
The United States army consists of twelve ranks. They are, in order of rank, Private, Private First Class, Specialist, Corporal, Sergeant. Staff Sergeant, Sergeant First Class, Master Sergeant, First Sergeant, Sergeant Major, Command Sergeant Major, and Sergeant Major of the Army.
I am in JROTC (junior reserved officers in training corps) so I have to know... Private Private first class specialist or a corporal (I am a corporal) sergeant staff sergeant sergeant first class Master sergeant or first sergeant sergeant major command sergeant sergeant of the army
Gunnery Sergeant is pay grade E7, and the equivalent Army rank is Sergeant First Class.
Master Sergeant in the Army is pay grade E8. First Sergeant is the other Army E8 rank.
Master sergeant
2nd Lieutenant.
There has yet to be a female Sergeant Major of the Army.
A platoon sergeant in the army is typically a staff sergeant (E-6). However, it is worth noting that in some cases, a platoon sergeant could also be a sergeant first class (E-7). The specific rank can vary based on the unit and branch of the army.
A sergeant is an enlisted soldier higher in rank than a corporal or private, lower than such ranks as staff sergeant and first sergeant. In the U.S. Army a sergeant has pay grade E-5 and wears three stripes.