E6 in 3 years? Is there such thing as making rank too soon?

I would tend to think so. There is a lot that goes into holding those higher ranks, things like in depth job knowledge, ability to handle difficult situations and people and simple maturity and confidence. While it is possible for someone to develop these that quickly, I would say the likelihood is low.

I was army and I made my E5/SGT in 2 and was on track for my E6/SSG in 3. It all depends on your MOS and points for promotion my MOS was 63W/63B and if I stayed in I would have changed to a 63H all in the mechanic family what changes is going from light mechanic to heavy mechanic and working on tanks. So if you want to rank fast know your job and know all things army like ARs, FMs,and DAPAMs. Also never get put on fat boy PT program and always pass your PT tests and max out your points on online learning, and take advantage of collage while Enlisted you will also get points for that. Also know army ethos, army history unit history and know the NCO Cread. Also if you get a chance go to the Audi Murphy board that Also is extra points that no one ever thinks of to do it might be hard but it is worth it in the end it helps with all other boards that you will have to do threw out your army career.

Simple answer is NO. But the Bible does have a lot to say about the mouth getting us into trouble.

Most of you were lucky to rise in ranks so fast. I was in the Navy for four couldn't get past 3rd class petty officer and I was a good sailor. Never got into trouble. Not advancing to 2nd class kept me from reenlisting.

I was in the Marine Corps, made E4 in 14 months.

The more I think about this question I realize that the answer is absolutely. But, maybe, not for the reason you are thinking.

While on active duty I knew people who would have been more than ready for a promotion to higher rank but didn't get promoted due to time in grade or time in service. However, at the same time, there were marines much older with more time in grade and service that should never have been promoted.

Two Staff Sergeants come to mind.
The first one had an attitude that if you were senior to him, you were just in the way. If you were junior to him, you weren't worth anything except to be ordered around. He did not exhibit the professionalism or the traits or a leader. He and I both got promoted about a month apart. Me to Sgt (E5) and him to SSgt (E6). Fortunately, the Captain we both reported to saw who he was. He ended up with a single LCpl working with him while I was given responsibility for a team that would have anywhere from 15 to 45 marines on it, based on deployment needs.

The second SSgt was one of only two individuals who ever got fired.
When given an assignment, he would postpone it until it was making the team look bad. He didn't care about his troops. Didn't maintain his appearance or his hygiene and was a poor role model. In the end, the OIC for our shop had to "fire" him after which he had to report to me. The project he was working on also fell to myself and another Sgt because it was 10 months behind schedule and the date was less than 90 days away. We were successful in getting the project completed before the due date. But it meant lots of very long days to do so.

Being promoted too soon is not a matter of Time in Service, Time in Grade, or even how old you are. It's whether or not you have the right frame of mind and the aptitude.

Being ready for promotion is about the maturity and leadership that you display. The ability to lead others and to inspire others to greatness, or at least to be successful.

You can be 20 years old and still command the respect of those around you. But you can also be 45 and nobody wants to report to you because you do not have good leadership traits and skills.

Maybe. However every MOS (rate) is different, and the individual progressing in the ranks is different.

I made staff sergeant at 4 years 3 months. I believe I was ready for the rank and responsibilities.
I will say how fast a person makes rank depends on their maturity and expertise. That may take some longer and some less time.

Being white and male in the Army has always had its privileges.

Having been in the pre-Vietnam Army, I made Sp5 in about 4.5 years. I had reupped for an additional three years on top of the first three. I think the PFC and E-4 out of basic programs are bad ideas, in spite of any incentives to college grads and top performers they might provide. You need to settle in to the culture. In time of general war this could be relaxed somewhat.