In my experience, they don't take "requests" but with older inmates, there are some considerations like getting the bottom bunk.

The parole system didn't "do anything" outside what they were supposed to do. What you should be focusing on is "Why your boyfriend can't keep from getting arrested for things like a DUI"? The parole system doesn't tolerate an offender with multiple offenses, who doesn't take the leniency of early release seriously. The only remedy is a simple formula that can only be overcome by staying out of trouble.

We dont know the extent of the violation or if there are any new charges pending to give you a decent answer. Keep your fingers crossed that the judge is in a good mood the day they make their determination.

The typical calculation is 85% of your sentence is what you'll serve. That equates to 15.3 months, with 4 months already served, there is 11.3 months remaining

Usually, you get the full sentence that was imposed, no early release. They usually do not tack on extra time unless he really did other crimes while he absconded

Felony gun possession is federal and is a mandatory 5 year sentence

the mandatory minimum for felony gun possession is 5 years

Sounds like he got three years but the release date hasn't been updated to incorporate about 15% for good time if he behaves

He should get credit for every day spent incarcerated. The booking arrest date is the first day, even if they were booked and released, they get a full day's credit. Five years is 60 months, good time is 15% so the actual length would be 51 months not counting some for halfway house (if offered)

Depending on the length of the sentence (over 12 months) and the bed space available in county, they will probably get moved to a state facility to serve the balance of what time remains