The Target Acquisition and Designation Sights, Pilot Night Vision System (TADS/PNVS) is the combined sensor and targeting unit fitted to the Boeing AH-64 Apache helicopter.
Lockheed Martin signed the original TADS/PNVS production contract on 30 April 1982, and the first TADS/PNVS system was fielded in 1983.
This allows images from TADS to be projected onto the crew helmet-mounted optical sights, overlaid upon their view of the cockpit and battle space.
But in recently fielded models of the AH-64D the ORT along with the DVO has been removed as it was rarely used.
[2] This upgrade is claimed to give a 150% performance and reliability improvement, while reducing costs through lower maintenance requirements.