Tanks are slow. Their swat vans get to the scene quicker. Plus, can you imagine the pandemonium if a tank came rolling down a public road? People would think WW3 started. Tanks are also more expensive to operate, it would be a bad financial decision for any police department to use them when they are not cost effective.
Also, tanks aren't effective in urban environments, which are the major area of operations for most SWAT-type teams. Armies, quite aside from police, have found armoured operations limited in urban and built-up areas. Armour is more suited to open countryside. It's worth noting too that tracked vehicles cause significant damage to tarmacadam and concrete roadways, and they generally need to be towed, usually behind a dedicated "tank transporter" to the required location- they are generally too slow, use too much fuel, and can suffer from mechanical problems if required to move long distances under their own power.
Unlikely. As long as there are specially threatening criminals, special reaction police teams will be needed.
There are a variety of formal teams within the police force. Some of these include the canine unit, the SWAT team, police detective and criminal investigator, helicopter patrol, street crime and gang unit, as well as internal affairs.
If you join the police in a city that has SWAT.
no you can not
There are no specific numbers. Almost all officers that perform SWAT type duties spend most of their time performing regular, everyday police work. When special circumstances require a special response, the SWAT team members are called to perform that- and then go back to regular police work.
SWAT is an acronym for Strategic Weapons And Tactics.
SWAT members still perform regular police work like patrols
You start by joining the police then when you have proved yourself there you apply for SWAT training.
In order to be on a SWAT team, you must be a police officer. SWAT Team members are selected from the ranks of police offiers and given specialized training by their department.