From my previous post....
"Getting back to 'BMSS' for just a moment, AGAS 5 was correct: it is the Box Metal Shipping Steel, NSN 8115-66-025-8558. It was 8 feet x 6 feet x 6 feet 4 inches, with a volume of 260 cubic feet (volume was mentioned in an earlier post). Cargo loading was maximum 10,000 pounds. Officially introduced into service in late 1967. 250 in the initial purchase. "
Mike C