SPESS MAHREENS!!!
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The Federation's Troopers are the single most feared thing in the whole galaxy.
Taken from birth and put under rigorous genetic modification and conditioning, these men have become the ultimate fighting machine.
By the time they are fully-developed adults ready to go into battle, they have undergone training so intense it has a 40% death rate.
Their skeletons are replaced with a much stronger material and advanced myomers are laced into their muscles.
A Trooper's armour becomes a part of him entirely.
It is made of an incredibly durable alloy whose composition is kept secret.
Only the strongest projectiles can pierce them, but they are fairly weak to continuous stress, such as that from a chainsword.
The suit, aside from the helmet, plugs into special ports covering the skin of a Trooper. These ports take information directly from the nerves and react accordingly.
A Trooper sees a sword coming at him, and his suit will automatically dodge or parry. A Trooper decides to shoot and his arms will automatically line up with the target.
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Trooper armour looks sort of like the Enclave Hellfire Armour from Fallout 3, but with larger arms and pauldrons.
It also has some glowy parts, similar to this image:
The helmet more closely resembles a 40k spess mahreen helmet, but with canisters attached, similar to a gas mask or respirator and a single piece retractable visor, similar to the rogue helmet from Halo 3.