The reader should note Moroni's preparation before making a covenant with the Lord: "He fastened on his headplate, and his breastplate, and his shields, and girded on his armor about his loins" (Alma 46:13). The symbolism of Moroni's actions in putting on all of his armor before making a covenant with the Lord is brought out by Section 27, verse 15 of the Doctrine and Covenants:
Wherefore, lift up your hearts and rejoice, and gird up your loins, and take upon you my whole armor, that ye may be able to withstand the evil day, having done all, that ye may be able to stand." (compare Ephesians 6:11)
[Alan C. Miner, Personal Notes]