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

yes

YES

Everyone is different, everyone matures differently.

In the regular surface or aviation Navy I would say no even a push button 3rd class out of "A" "C" school, but in the Nuke side I would say yes its possible because once done with nuke school they are E-5 and be eligible for test on the next cycle.

My wife made E-7 in 7 years before going officer. Me - never enlisted - commissioned and warrant, 28 and 10 years.

Depends on a lot of factors, to include Mos, deployments (op speed). High speed low drag? Spec ops would make this easy to have happen. E-3 to direct E-5 finish selection, q course could easily be E-6 via waivers that quickly. To much goes into this made rank quick too. E1 to E4 in 11months obviously die to waivers

It took me 8 years to E6. I suppose it could be done in three at the right command if the Sailor was a workaholic and smart. I still think they'd be lacking experience however.

Depends on the situation. I was an E-5 in 90 days, and E-6 at one year and and E-7 at 18 Months in Service. This was during and in Vietnam and I was an Infantry Soldier. We lost Leadership very quickly back then and it was whoever was still alive and not WIA moved up to the next position. I was a PSG E-7 But when I was WIA and sent back to Fitzsimmons Hospital they returned ne to E-6 as there was An Army Regulation that said you had to have Seven years in the Army to be an E-7.

simple answer is yes. it all depends on the person maturity level. Some have it due to circumstances of seeing the world through the eyes of an adults eyes for what ever reason. And there are some that do not have it but are very book smart. Back in the 90's the Air Force made a major mistake in Force reduction they tried to get people to get out by offering them a large lump sum of money instead of staying in to retire thinking that those closest to retirement age would take the money. Did not think they would smart enough to understand they would be cheating themselves out on a lot of money and benefits in retirement pay over their years. Instead the middle management E-5 thru E-6 with less than 10 years in took the money an ran for the hills. This left a vacuum of experience and maturity that the AF then tried to correct by lowering the promotion score to allow people that had 2 years of college come in as E-3 then put on E-4 in a year or two and with high test scores get promoted to NCO status within 4 years of service and so on. After that it becomes a Promotion Rating game of who you know, who writes your evaluation report, awards, but that is another long subject that I believe all services have tried to fix but promotion environment won't change.

Absolutely. We're definitely 100% promoting way to early. They just don't have the day to day experience to lead. They just memorized some sh*t in a TM/AR/etc and passed a board. They're not humbled yet. They all think they're untouchable and big headed. They don't know how to handle different Soldiers differently, cause it's still just a "one size fits all" type leadership for them. Hell I knew a 1SG (SFC), with only 11 years. Dude was so toxic, but thought he was the best thing since sliced bread cause he was given the 1SG position really early.