I was there a little later, from July 75 to November, when Korat AFB in Thailand closed down and we got PCS'ed to Clark for the rest of my 1-year unaccompanied tour. You're right, sometimes there was a bt of sediment in the bottle, but San Magoo is still some of the best-tasting beer I've ever had. The "export" stuff that's available here in the states just isn't the same!
Jerry