Former Marine trumpet player Marshal Milton identified this band as the 3rd Marine Division Band. He was there.
Curtis King wrote, "The band at Khe Sanh was of December '67...We flew hot Christmas dinner in huge vacuum containers for all the troops at Christmas dinner. We tied red and green smoke on our struts and had a large Santa Claus taped to the nose...we would come in with the hot chow and pop the smoke...." Thank you Curtis, for making Christmas "in country" just a little brighter for troops in a a dark place!!
Photo courtesy of Curtis T. King
This band played honors for the KCo, 4thRegt, 3rdMarDiv tribute to lost comrades at Khe Sanh. 
Anyone know what band that is??? 
This is an official Marine Corps photograph taken by SSgt Herb Richardson
 on October 9, 1968.

Photo courtesy of George Curtis

Now THAT is a short-timers uniform!!
3rdMarDiv Band Barracks - Okinawa, Japan
Photograph courtesy of Bruce Travis

3rd Marine Division Band Barracks, Camp Courtney, Okinawa, Japan
(on the end)
Photo by Jim Wood
3rdMarDiv Band rehearsal hall, Camp Courtney, Okinawa
Photo by Jim Wood

Bayview Enlisted Club, Camp Courtney, Okinawa
Located conveniently across street from Band Barracks
Photo by Jim Wood
3rdMarDiv Band plays the Koza USO, Okinawa
stage LtoR: Jim Wood, John Lee, Bill Clemons,  JM Lorch
floor: ? and DR Carriger?
Photo courtesy of Bruce Travis

Headquarters, 3rd Marine Division
Camp Courtney, Okinawa, Japan
Photo by Jim Wood

3rd Marine Division Band, Okinawa, Japan - Spring 1970
John Lee, Drum Major
Photo Courtesy of John Lee