Final answer:
OMAS-R is the acronym for the computer-based information system used by OMAs and IMAs to manage maintenance-related functions efficiently.
Step-by-step explanation:
The acronym for the automated management system that provides Operational Maintenance Activities (OMA's) and Individual Mobilization Augmentee (IMA's) with a modern, real-time, responsive, computer-based information system is OMAS-R, which stands for Operational Maintenance Activities System-Reserve. This system is designed to enhance the management of maintenance-related functions and ensure efficient and effective operations for OMA's and IMA's.