PotatoChip i did what you’re trying to do. Left my airline when I finished school and commissioned for AD (non-flying MOS). Told mgmt i had orders coming to be nice. When i got em i emailed a copy to my managers/HR/union and that was that. During my AD time (6 years) I didn’t hear a peep from the company. They were very military friendly though. I was lucky enough to maintain flight benefits too! Even added my spouse to my airline benefits mid way through the milleave.

But like others have eluded to, get smart, know the answers, TELL HR what you’re doing (don’t ask), drop your orders and embrace the suck. NOT a SME on USERRA but my experience went off without a hitch. PM if you have questions