In the various militaries around the world, armorers often maintain the armory of a military organization. An armorer instructs military personnel on the proper maintenance and care of weapons issued to them. The armorer maintains receipts for equipment issued locally and also while on deployment. He or she is responsible for inspecting and repairing all arms they are responsible for. On ships, an armorer is responsible for the correct working of all weapons used by marines and sailors that vessel.