 The initial cost of these computers ranged from about $139,000 (D-37C) to $250,000 (D-17B).The existing Minuteman-III missiles have been further improved over the decades in service, with more than $7 billion spent in the last decade to upgrade the 450 missiles.The Minuteman-III has a length of , weighs , an operational range of greater than , and an accuracy of about .