Lapel pin is triangular shaped. Looks like t has silver circle shapes on either top side, overlayed on gold. I could not detect the medical snake, but wasn’t able to enlarge very well.
Protection: A team of security patrol the Rhinebeck streets ahead of the ceremony which took place at 5pm
http://www.dailymail.co.uk/tvshowbiz/article-1299334/Chelsea-Clinton-Wedding-Pictures-Bill-Hillary-happy-daughter-walk-aisle.html#ixzz4Gg7gtQLs