flares

Does anyone have a suggestion as to disposing of flares that are over date? I have at least half a dozen flares that are 5 years or more out of date. Thanks in advance.

I know that I'm not the only one who has out of date signal flares and rockets. But now I have a real collection of them! Although I do keep some on board as "spares" the bulk are at home and I do want to safely get rid of them. I sail on the Chesapeake Bay but live in south central PA. Just...