The first recorded proof of arms is possibly from China. In a cave in Sichuan was found a statue dating back to the 12th century. This statue portrays a man with flames and a cannonball that comes out of a vase shaped bombardment. The oldest real weapon that was discovered was possibly from 1288. Arms of fire with the west did not make it until the 14th century, but spread fast and by the 16th century the world had weapons.
Since then, guns have become increasingly the weapon of choice for most dangerous circumstances and outdated other arms. Firearms have become a word that alludes from a gun to a nuclear weapon. In war zones all over the world, weapons are currently used also in gang wars in Western countries like America, which destroyed more than 3000 guns in 2009.
If you want to be a near protective officer, you will have to develop a great understanding of guns, but perhaps not the nuclear weapons! You will have to learn about the use of weapons and how to combat the use there.
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Any good narrow defence class will provide you with training in firearms which should include training for the tactical weapons CQB and the shooting and retrieval of vehicles at night. This is particularly important if you work in dangerous or violent environments or even travel in a hostile environment but you will still have to take care of how the threat of weapons can be confronted while operating in a western world.
It is typically an immense advantage to have operational experience in a world where weapons are deployed despite this specific training. This is so many of the officers for close security are ex-military veterans. If you have no prior tactical experience, this does not prohibit you from becoming a near protective officer, it just means that you will most probably have to make special efforts to keep you up to date with weapons training. Healthy courses normally give you a sense of a tactical situation in circumstances of the role play.