The RP-12 is the standard medium repair pod used for field repairs to the exterior hull of Earth Fleet starships and

A repair pod outside the Archimedes Station

starbases.  It is basically an enlarged spacesuit fitted with computer-controlled heavy manipulator arms, an onboard toolkit including an enzyme welder and plasma cutter, and an enhanced maneuvering thruster system for extended untethered spacewalks. These can be used to conduct routine maintenance on exterior sensor arrays and weapons mounts, as well as conduct some repairs of battle damage such as sealing small hull breaches.
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