The term 'Arsenal Contents' refers to the items stored in a military arsenal. The crossword solutions for this term are 'ARMS' (4 letters), 'AMMO' (4 letters), and 'ARMAMENTS' (9 letters). ARMS are weapons, such as guns, swords, and knives, that are used in combat. AMMO is short for ammunition, which are the bullets, shells, and other projectiles used with firearms. ARMAMENTS are military equipment, such as tanks, aircraft, and ships, that are used in warfare.