They're called "Stun Grenades" (or "Flash-Bangs" for short). They are really nothing but huge firecrackers stuffed with explosive and flash powder. They are non-lethal unless it lands in your lap, and when it goes off in a confined space they are meant to stun and dis-orient the persons in the room so that they are distracted from the entry team.
No, he does not.
SWAT teams.
Some probably do, but in general SWAT teams and police officers use whatever is issued to them by the deparment where they work. In the U.S. every department issues whatever they see fit. Most common are .223 (5.56) and .308
they have to do lots of difficult duties....<333
There are three levels of tactical teams in the FBI: the Hostage Rescue Team (HRT), the 11+ regional Enhanced SWAT Teams and the field office SWAT teams. The HRT is the national team and a full-time commitment. When they are not deployed, they are training. Every field office has a local SWAT team which is a part-time commitment in addition to the agent's normal investigative duties. The enhanced SWAT teams are somewhere in between, with more training and commitment than the local teams, but still not full time. The agents still have normal case duties.
Yes, some SWAT teams utilize specially trained K9 units to assist in operations such as tracking suspects, detecting explosives or narcotics, and providing security. These highly trained dogs play a valuable role in enhancing the capabilities of SWAT teams.
I believe the answer is yes, that the UK does have an equivelant to the US SWAT teams -HOWEVER- I will defer to a UK contributor for a more "official" response.
no
SWAT teams, the military, and money carriers
Yes they are allowed
They use SUVs and trucks for off-road emergencies, such as high speed chases. They also use them for the dog squad, rescue squad and swat teams. They are necessary for the equipment they carry.
Unlikely. As long as there are specially threatening criminals, special reaction police teams will be needed.