Definitions for "SRMs"
The Shuttle Remote Manipulator System (SRMS) is the Space Shuttle's robotic arm. It is used for a varitety of tasks, including payload deployment and retrieval, Extra-vehicular activity (EVA) assistance, mating payloads, and surveying the payload bay.
Self-Replicating Mines are devices that can defend entire sectors against jumpships. Any jump-equipped ship that attempts to pass through an SRM field has a chance of being destroyed by the mines.