I'm also a volunteer firefighter and the "pack test" level of Work Capacity Test for wildland firefighters is 3 mi on flat ground carrying a 45 lb pack in 45 minutes.
It is pretty important to be in shape as you are often carrying a lot of gear and don't want to bonk and cause an issue that would jeopardize yourself, your teammates, or the mission.
Edit: to answer your second question, my wife and I hike recreationally just about every weekend and the team often hikes during trainings and does a weekly casual hike as well.
His latest post is from a year ago: http://perryscanlon.com/MSJinfo_phpBB3/viewtopic.php?f=1&t=6....
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https://www.otherhand.org/home-page/search-and-rescue/the-hu...
I first read it seven years ago and similar to the author, it inspired me to join my local Search & Rescue team which has been incredibly rewarding. I highly recommend doing that to anyone who wants to combine a love of the outdoors, specialized skills, serving the community, and helping people in their worst moments. (And doesn't mind getting up at 3am in pouring rain and going out and pushing through dense underbrush for hours!)