Back when I was running the state rifle team, I used to put on two DCM Marksmanship schools a year with about 250 attendees. We always warned of the dangers of M1 thumb. For the first couple of years we would have a couple of cases of M1 thumb everyday. 
In later years, before we went to the firing line, I showed the shooters the state pin on my hat explaining it was the prize for the first M1 thumb. I explained that it was a nice pin but if you got it, you'd have earned it. 
Only had about one M1 thumb every two years after that. Somehow, it made the caution a lot stronger. 
Last edited by Dick Jones otp; 11/08/10 08:00 PM.