It is a "Libero" which is a main defense player.
There is no limit to the amount of defensive specialists a team can have.
Doesn't matter, as long as you have more 3.
A defensive end is the name of a defensive position in American and Canadian football, situated at each end of the defensive line.
Defensive driving are safe driving techniques that drivers do to avoid another drivers mistake.
From my experiences a defensive specialist is usually called a Labero. (La-bear-o)
some long-name thing
The back 4
This is called a Crime Laboratory Analyst.
I would say if a country has a defensive treaty alliance with another country it would mean that they would not fight with that country, but also that if the country they had the alliance with were to be attacked by another country that they would help to defend them.