Shamelessly stolen from Louis XI on the .net forum:

I. They belong to the Triarii.
II. These swords are respectively, from top to bottom, the Greek Xyphos, the also Greek Kopis and the earlier Gladius Hispaniensis.
III. The round and heavy is the clipeus, the Roman equivalent of the aspis, the oval and big is the Scutum while the round and small is the parma, also parma equestris.
IV. The clipeus belongs mostly to the Triarii, the Scutum belongs to line heavy infantry such as the Principes, while the parma equestris belongs to the Equites and to light skirmisher troops, like the Leves.
V. The helmets from the upper left belong to the Hastati, while the ones from the lower right belong to the Triarii.