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Assistant commandant is not a rank, it is a position.
CTR is not an Army rank it indicates a contractor position.
general army is a higher position than general police as general police is two star rank whereas general army has five star rank.
India is at the first position among the world army.
Recruiter duty has little to do with rank, although most recruiters are of paygrade E-5 (Sergeant) or above. So, no, Army recruiters are not of the lowest rank. Most Army recruiters now on duty have served in the Gulf, Iraq, or Afghanistan.
im not for sure of the years but ever rank requires a certain time of being on duty
You just need to be in a leadership position, is all.
Six years, with a minimum of 6 months of active duty. As most current reservists have seen, the President can change that if he deems it necessary.
Which Navy did you have in mind? There is no such rank in the US Navy. Command Sergeant Major is a high enlisted rank in the US Army, and denotes the senior NCO of whatever unit or element they hold the position in (it can be anywhere from Battalion to Army level).
The "Officer of the Deck" does not have to do with rank, it is a duty position which rotates between personnel on watch.
For lower enlisted, yes, as those are automatic promotions based on time in service. So, if you're a Specialist or lower, you shouldn't lose rank. If you're going to the Regular Army from the Army Reserve as an NCO, you should expect that you'll loose at least one rank/grade.
No, there is no rank of commander in the Army. In the Army commander is a title, not a rank. In the Navy, there is a rank of Commander, it is the equivalent of Lt Colonel or O-5.