The term 'Arsenal Inventory' refers to the weapons and ammunition that a military or other organization has in its possession. The crossword solutions for this term are 'AMMO' (4 letters) and 'WEAPONRY' (8 letters). AMMO is a general term for bullets, shells, and other projectiles used in firearms, while WEAPONRY is a collective term for any type of weapon, such as guns, knives, swords, and explosives. Together, these two words make up the arsenal inventory of an organization.