Final answer:
Gaius Marius did not require troops to purchase their own armor in his reforms of the Roman army. He abolished the property requirement for military service, reorganized the structure of the Roman legion into cohorts, and introduced pay for military service.
Step-by-step explanation:
Gaius Marius implemented several reforms in the Roman army, but one of the reforms that was not instituted by him was requiring troops to purchase and bring their own armor.
One of his key reforms was abolishing the property requirement for military service, allowing those without land or significant wealth to join the army. He also reorganized the structure of the Roman legion into cohorts, which improved the army's flexibility and effectiveness in battle.
Furthermore, Gaius Marius instituted pay for military service, ensuring that soldiers received regular wages for their service.
Learn more about Reforms in the Roman army by Gaius Marius