I am a bit confused by the NY State Trooper Police ranks and structure. They have sergeant and lieutenant ranks, like most police organizations. However, I notice that there is an entire set of ranks in between that resemble the enlisted ranks of the US Army.

On the their website, it states that one can compete for the sgt rank after 4 years, then the LT rank once one is a sgt for 2 years.

So, are all the other sgt ranks (staff sgt, 1st sgt, etc,) for those who chose not to go for LT? Does a new LT have authority over a technical sgt or first sgt who has been a trooper for more years than a LT?