I worked for the California state system, starting as a Correctional Officer and retiring as a Lieutenant in 2005. I now write for the PacoVilla blog which is concerned with what could broadly be called The Correctional System.
Any number of possible reason. Could be he needed or wanted some sort of program that was available at another facility. Could be medical reasons. Could be an enemy situation. Could be a basic change in his custody level or of the custody level of the facility. Could be he pissed off somebody with enough juice to get him moved.
Some are very good. Some are hopeless idiots. Most are in the middle. Just like males.
Minimum age depends. As far as I know to be a peace officer in the U.S. you must be 21. Often they will hire you at 20 `1/2 so you are 21 when you actually get out of the academy and go to work. If you are a :"jailer" (non peace officer) you can be hired at 18 in most states.
Public (government) and private is about it. Public is "better" in that it pays better, you have more authority, more legal protection and as far as I know always better benefits and retirement.
Flight Attendant
 What kinds of passengers annoy you the most?
What kinds of passengers annoy you the most? 
                                        
                                        
                                             School Bus Driver
 Do the kids treat you with the same amount of respect as other authority figures at school?
Do the kids treat you with the same amount of respect as other authority figures at school? 
                                        
                                        
                                             CBP Officer
 Why are so many customs officers huge jerks?
Why are so many customs officers huge jerks? 
                                        
                              All kinds.
In Ca yes. I think it is 13 weeks right now. I suspect there is some sort of legally mandatory minimum training in all states for peace officers.
The system I worked for had almost zero cells that held more than two people. The procedure is pretty much the same. Sound an alarm. WAIT FOR BACKUP. (Inmates sometimes stage fights to draw officers into an area in order to attack them, steal keys, etc.) Often chemical agents are deployed before the cell is entered. When it seems appropriate you go in, separate and restrain (usually handcuff) the combatants and haul them to medical before throwing them into ad. seg.
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