wrap was fixed around the head of each periscope). The periscopes also had problems with their optics: periscope users reported difficulty in refocusing after changing magnification, duplication of images, and bands across the field of vision. These problems were attributed to RAN demands that the optical view be the first exposed when a periscope was raised above the water, instead of placing the infrared sensor and single-pulse radar at the head as on other submarines, requiring the optical path to be routed around these components. The periscopes were gradually improved, and were no longer a problem by the time the fast track submarines entered service. Combat system Despite the public focus on the various physical issues with the boats, the major problem with the submarines was the development of the Rockwell combat system. The problems had started during the funded study, when Singer Librascope and Thomson CSF, who were partnering with Rockwell to develop the combat system, refused to release their intellectual property or their software code for Rockwell to sell. It was proposed that Computer Sciences of Australia, a division of Computer Sciences Corporation and a minor partner in the consortium, take over the role of writing the software for the combat system, although this meant that Singer Librascope, which had prior experience in creating submarine combat systems, was reduced to a minor role in the project. Other major problems with the system, to which most of the later difficulties were attributed, were that the original concept was beyond the technology of the day, and that the system architecture required by the RAN was both overly ambitious and flawed. This was compounded by the rate of advancement in computer technology: equipment had to be designed from scratch and custom manufactured at the start of the project, but by the time these were installed, they were obsolete compared to commercially available hardware and software. Australian Submarine Corporation was made responsible for the delivery of the Rockwell combat system, but had little ability to enforce this. Rockwell was contracted to deliver the combat system by 9 September 1993, but was unlikely to do so. ASC's management board voted to issue a default notice to Rockwell as the American company had defaulted on the contract, but was ordered by the Department of Defence to retract the default notice and accept gradual delivery of partially completed versions of the combat system—referred to as