The Silver Buffalo Award is the national-level distinguished service award of Scouting America. It is presented for noteworthy and extraordinary service to youth on a national basis, either as part of, or independent of the Scouting program. The award is made by the National Court of Honor and the recipient need not be a registered member of Scouting America. 

The Silver Buffalo Award was created in 1925[ based on the Silver Wolf Award of the Boy Scout Association. The buffalo pendant was designed by A. Phimister Proctor. A red-white-red ribbon bar was introduced in 1934 for informal uniform wear. In 1946, ribbon bars were replaced by the current square knot insignia. Read the wikipedia entry here