Serious question. How do you stack drills in the VTU? Do you find an active unit that will let you come and work for free??
You use NSIPS and reschedule the drills. And yes, you find someone for whom to work for free. It's not that difficult. COVID has made this much easier due to telecommuting. But, even before COVID, you work it out with the unit / command you want to support, get a telework package submitted and grease the skids with your NOSC CO. Most would welcome you doing something useful.
My NOSC CO only made a deal out of it once in the last 2 years because at the time he did, they were getting ready for a regional inspection. To fix that glitch I had the person for whom I was working for free send the NOSC CO and email detailing what I was doing and that I had agreed to perform the work via telecommuting and in a non pay status. Easy day.
...every IRR person I spoke to said they hated it and couldn't wait to get to 20.
It depends on the person but most are lazy and whine about things. One of my O4's is a local elected official who dropped from SELRES to VTU after getting elected. He then went right back to the same SELRES unit and has been with them ever since. He's the ADMIN DH and is outperforming the other O4 SELRES in the unit.