Student loan forgiveness cutoff

So recently medically retired and I understand that student loan forgiveness is something I qualify for. My financial aid office at my current school is encouraging me to take out student loans so I at least get grandfathered into the grad plus loan prior to the change this summer, and mentioned that there is a cap on if/when you can do student loan forgiveness. I have been unable to find it and she mentioned it was in the BBB. Again I can’t find any information on that, but to me this seems too good to be true to be able to take out max loans if I’m using the GI bill where I do not need any loans for school. Can someone who is less of a Neanderthal than I am explain how this works? If there’s a current expiration date by when you can take them?

All I’ve been able to understand is that this is a one time loan forgiveness on loans you currently have or take out(have to be federal loans and I have to be the one who signs for them), and once forgiven they are viewed as taxable income but that’s really all I know.