The cones were collected for seed to be used for reforestation purposes. The cones had to be removed from the tree just as the seed was getting mature but before the cone had a chance to desiccate and open allowing the wind blown seed to be released to the wild. I didn't know anything about the process but I was not foreign to climbing trees as a younger kid. My neighbor at the time worked for the USFS and would come up and help my dad and I on weekends build our house. He asked me that year if I wanted a job. I told him I had one as it was just my dad and I building his 3600 sqft, 3 story house. He came back with: "a job that pays", that got my attention. In this case, the USFS managed the orchard for Western White Pine seed. The white pine has a storied past of being preferred for main masts in the ship building era. Both eastern and western.
https://colonialquills.blogspot.com/2013/11/white-pine-trees-and-american-revolution.html
In this case, the USFS managed the local orchard and were recruiting climbers. I took to it pretty fast outpacing the earnings of any other climber the first year. Years later crews would show up to challenge my production and yet failed. My older brother would come over and pick and since we were by far faster, I was able to lock in my preferred 10 rows; 4 for me, 3 for my brother and 3 for my dad. My dad would show up on a cool morning and pick one tree for me and one tree for my brother and call it a season. Then my brother and I would pick the rest of the trees in the 10 rows. Nobody else got more than 2 rows assigned to them. These trees were about 60' tall or so.
The white pine is a preferred timber species, although waning, because it has a problem with blister rust. The orchard I was picking in had been genetically selected and bred to be somewhat resistant to the rust so it would hopefully grow to full maturity in the woods. Therefore, woods collection of cones/seeds was frowned on.
I had also picked some Ponderosa Pine cones but those trees were massive and the production was a lot slower due to the climb time. It's a bit humbling when you would pick cones into a burlap bag, tie it off and then hang out as far from the tree bole as possible and let the bag go. Get a solid 8 second count and sometimes more before the bag would hit the ground. A guy's got to trust his equipment at that height.
I've worked in other orchards since then and most recently helped on a woods collection for Noble fir using a helicopter. That was a fun project too.
Pic of me climbing the tree: I had to run up and collect some foliage for grafting to add this family into an orchard block. They won't let me climb anymore.