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Dear Ms. Forest,
Thank you for posting your request on History Hub!
Some codes commonly used on Compiled Military Service Records (CMSRs) are listed on the post CITIZEN-ARCHIVIST'S GUIDE : CMSR CODES, although we did not see all of the ones you quoted listed on that guide. Please email the National Archives at Washington, DC - Textual Reference (RDT1) at firstname.lastname@example.org and attach a scan of the CMSR and they will try to figure out what the other abbreviations might mean.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT1. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this is helpful. Best of luck with your research!
Thank you, Mr. Atkinson for your assistance. I will absolutely check out these resources.