Many years ago a business associate (another Constable) had suggested that we work security for the Marathon. He then found out that they prohibited carrying a weapon and both of us decided "nope"! Now that I'm a ham, my response is the same.
That was a great event! If you're scared to press the PTT, you should definitely volunteer next time, there's lots of new hams on the job. And the volunteer jackets this year are NICE.