I am an experienced Scouter, an Eagle and a Vigil Honor member of the Order of the Arrow. You may NOT wear the Eagle medal whenever you want. The badge is for everyday wear for youth, as is the square knot for adults. The medal is exclusively for special events, for both youth and adults. Special events include troop Court of Honor, Eagle Court of Honor, Blue and Gold Banquet, District award dinners, and other similar events at the troop, district, council, regional, and national level. It is inappropriate to wear your medal to troop meetings, campouts, ect. This is similar to the policy on the OA sash. The OA sash is only to be worn at OA events and formal events. Hope this helps.
In the Sprit of Scouting,
Lilchpin
Vice Chief of Nacha Tindey Lodge, Order of the Arrow