BLUF: Do whatever you must to make sure your retirement orders reflect the appropriate amount of service credit. Just like with any other personnel action, only you have the vested interest to make sure your orders are correct.
I retired in 2017 and outprocessed from Ft Hood. I thought I adequately planned ahead: talked to the folks at the USU personnel and JAG shops, read up on Board for Correction of Military Records (BCMR) cases, talked to other colleagues and heard their similar horror stories. I sent the certification letter from USU and the related DoD memo to my transition counselor on three separate occasions - initial contact 6-months out, first set of retirement orders, and one week prior to my final out appointment - didn't do a damn thing. Even after the counselor got specific email guidance from HRC regarding my case, I still stayed until 1900 the day of my final out to make sure the calculation of my time was correct and was reflected correctly in my orders. They had to issue me a new set of orders to do it, and I stood and watched my counselor fax everything to DFAS; luckily, when the retirement pay memo came from DFAS, it was all correct.
The problem I saw was that there is no clear front-line guidance to the transition counselors, and there is no separate line item in the retirement order software to account for USU time. My counselor had some proprietary MS Word template that she used to print a separate statement onto the length of service calculation worksheet.
Ultimately, what you want to make sure of is that ALL your time is represented correctly (for Army orders) on the line that says "Section 1405: XX years, YY months, ZZ days." Technically, USU time is not Section 1405 time, but that's the only place they can account for it with the current system. I also had them put a line in my DD-214 remarks section stating "Block 12C does not include active duty service in USUHS 200xxxxx - 200xxxxx".
@a1qwerty55, I hope the Congressional is successful. All the research I did prior to retiring tells me that your only likely recourse at this point is a BCMR. Your case is very likely a slam dunk, but the wait time is ridiculous.
PS: They can always hurt you more. I'm still trying to get a corrected W2 for 2017 because MILPO/DFAS under-reported the tax withheld from my active duty pay.