Today, Saturday, May 19, 2012, the haunting call of  “Taps” will roll across Arlington National Cemetery from the horns of 200 buglers assembled to mark the 150th anniversary of the now-famous military signal. “Taps,” known to most as a funeral and memorial homage, originated during the Civil War as a call for lights out. Adopted by both Union and Confederate armies, it has a fascinating and powerful history that continues today.