Goliath powered armor
The powered armor issued to Martian Force Recon marines: vacuum-rated, proof against most small arms, and built around integral weapons including a multi-barrel minigun and back-mounted rockets.
Goliath is the powered armor the Martian Marine Corps issues to its Force Recon marines. A suit is vacuum-rated and stops most small arms. Its weapons are built in rather than carried: a multi-barrel minigun firing armor-piercing, high-explosive and 6.25mm incendiary-tipped caseless rounds, and rocket-propelled grenades mounted in the back that can be aimed remotely. Hand grenades clip to the outside of the shell for storage. The design has run through several marks; their firmware will not run on the older suits.
How far into The Expanse have you read?
Set your place and this page rewrites itself to exactly that point. Nothing ahead of you will show.