No need to go to bobdunsire; here are three links to peruse:

St. Louis Caledonian Pipe Band: http://www.slcpb.com/

John Ford Highland Pipe Band: http://www.jfpb.org/

Dave Gallagher, Irish warpiper: http://www.stlouisirishpiper.com/

Since this is for a military reunion, I would try John Ford first, since they are affiliated with the American Legion.

Let me know if you have trouble, and I can put you in touch with the Scottish St. Andrew's Society of St. Louis for possible leads.

Yours aye,

Todd