It was indeed the "get rid of white-tailed in mule deer units" program. It seemed like a good option because the dates were all of December, units were a reasonable drive from COS, and either-sex & antlerless were available.
Was looking at the leftover elk list, thought that was where I was supposed to look. I'm not someone with years of experience, just getting started. Next year I'll read the booklet like it is a thermodynamics textbook.