Interesting topic. I like them all so far.

From Wikpedia: Army Regulation 220-90, Army Bands dated December 2007, Paragraph 2-5h(1) states the following: “Echo Taps” or “Silver Taps,” the practice of performing “Taps” with multiple buglers, is not authorized. “Echo Taps” is not a part of Army tradition and improperly uses bugler assets.

Army Regulation 600-25, Salutes, Honors, and Visits of Courtesy, dated September 2004, Glossary, Section 2 states the following: "Taps The traditional “lights out” musical composition played at military funerals and memorials. The official version of “Taps” is played by a single bugle. In accordance with AR 220–90, “Echo or Silver Taps,” which is performed by 2 buglers, is not authorized."

Bummer