Several of the Victor B.2s had been converted for Strategic Reconnaissance missions following the retirement of the Valiant in this capacity. In service, this type was primarily used in surveillance of the Atlantic Ocean and Mediterranean Seas, capable of surveying 400,000 square miles in an eight-hour mission; they were also used to sample the fallout from French nuclear tests conducted in the South Pacific. Originally reconnaissance Victors were equipped for visual reconnaissance; it was found to be cheaper to assign Canberra light bombers to this duty and the cameras were removed in 1970. Subsequently, radar-based reconnaissance was emphasised in the type's role. The reconnaissance Victors remained in use until 1974 when they followed the standard bombers into the tanker conversion line; a handful of modified Avro Vulcans assumed the maritime radar reconnaissance role in their place.