If you opt out, you get a severance pkg of 1 wks pay for each of the 1st ten years + 2 wks pay for each full year after, with a cap of 52 weeks. They will also pro-rate each day you are there of any partial year after that (current year, foe example).
If you opt in but don't have a job offer by July 31st, you get the same EXACT severance pkg. Both are the same, no differential in "voluntary" or "involuntary" as they had with Section Management. They did that to sweeten the pot for SMs so more would voluntarily take it, and they don't want to sweeten it for us...as they don't want too many operational people jumping ship before they are ready to handle the workload that would still exist. (SMs had a voluntary pkg of 1.5wks/3wks pay for years 1-10/10+...involuntary if not job offer was 1.5wks/2wks. Their cap was also 70-something weeks.)