Just got back from two days on post at a club race weekend and figured I'd share how it went. I'd only ever done track days and spectator stuff before, so signing up for the flag crew felt like a big step. Turns out standing in the sun for six hours waving flags is way more physical than I expected. My shoulder is wrecked in the best way. The communication side was the surprise for me. You're constantly on the radio relaying what you see, and the race control folks expect short, clear calls. I fumbled a few early on but by Sunday afternoon it clicked. Watching a wreck happen in front of you and having to report it calmly in five seconds is a whole diferent skill.
Best part was the people. Most of the crew have been doing this for 20 or 30 years and they just want to help the new guy learn. One of them told me the licensing path goes step by step, region first, then upgrades as you get weekends logged. allready signed up for the next event on the calendar. If you've been sitting on the fence about volunteering, the barrier to entry is lower than you think.