Indeed -- it appears for this context to be the case that "once a Scout, always a Scout."
Interestingly, BSA do not appear to have any documented requirements around this unit recognition. In fact in all our preparations, we found almost nothing to assist us in preparing for this. Even the museum came up empty on this one. Despite some heroic efforts, all national could provide was one name of a military officer that had ordered a pair of gold stars for another unit. By the time this bit of information was received, we had already written our own ceremony and circulated it back to the local folks in Boulder Dam Area Council.
The local units have been OUTSTANDING in their support of this effort, arranging for media coverage (including Boys' Life magazine!)
We're actually on our way to the airport shortly to fly out for the ceremony this coming Tuesday (Veterens' Day, 11-Nov), at 2pm in the Veterans' Memorial Park in Boulder City, NV. All are welcome to join us!