What is the Mormon position on keeping weapons and on war?

I have come across a chapter in the Book of Mormon that is very interesting. It details how the Nephites thought it would be better to bury their swords and never kill another person again. The Lamanites came against them for war, but the Nephites did nothing and about 1000 of them were killed. After that some of the Lamanites felt regret for killing them anyway and repented of their sins. They then joined the Nephites and buried their swords as well. Alma 24:18 Sums up the Nephites' disposition: > And this they did, it being in their view a testimony to God, and also to men, that they never would use weapons again for the shedding of man’s blood; and this they did, vouching and covenanting with God, that rather than shed the blood of their brethren they would give up their own lives; and rather than take away from a brother they would give unto him; and rather than spend their days in idleness they would labor abundantly with their hands. With this story in mind, what is the LDS position on war, self-defense, and keeping weapons?