The Indian Army has decided to replace the main commander's sight on all current and future T-90S main battle tanks, and has issued a request for information for this. The T-90's PNK-4S commanders sight, manufactured by Russia's JSC Rostov Optical-Mechanical Plant (ROMZ), has been found to be far below what the Army wants, and it has therefore put out an RFI for an advanced thermal-imager based panoramic night sight.Photo by Shiv Aroor @ Exercise Desert Strike, Pokhran