Question: The Yokosuka B4Y, (Navy Type 96 Carrier Attack Bomber), is an aircraft carrier, and torpedo bomber was used by the Imperial Japanese Navy Air Service from 1936 to what year?
Context: The 4th Air Group (第四航空隊 , Dai Yon Kōkūtai ) was a land-based bomber aircraft unit of the Imperial Japanese Navy Air Service (IJNAS) during the Pacific campaign of World War II.  The unit was formed on 10 February 1942 and flew the Mitsubishi G4M "Rikko" Navy Type 1 Attack Bomber aircraft.  That same month, the 4th Naval Air Group (NAG) deployed to Rabaul, New Britain and supported Japanese operations during the early stages of the New Guinea Campaign, first as part of the 24th Air Flotilla and from April as part of the 25th Air Flotilla.  The newly arrived unit took heavy losses on 20 February during an action off Bougainville, losing 15 of 17 bombers sent to attack a United States Navy aircraft carrier task force. An aircraft carrier is a warship that serves as a seagoing airbase, equipped with a full-length flight deck and facilities for carrying, arming, deploying, and recovering aircraft.  Typically, it is the capital ship of a fleet, as it allows a naval force to project air power worldwide without depending on local bases for staging aircraft operations.  Aircraft carriers are expensive to build and are critical assets.  Carriers have evolved since their inception in the early twentieth century from wooden vessels used to deploy balloons to nuclear-powered warships that carry numerous fighter planes, strike aircraft, helicopters, and other types of aircraft.  While it is possible to launch heavier aircraft such as fixed-wing gunships and bombers (it has been done) from aircraft carriers, it is virtually impossible to land them. The Mitsubishi G3M (九六式陸上攻撃機 "Kyūroku-shiki rikujō kōgeki-ki": Type 96 land-based attack aircraft "Rikko"; Allied reporting name "Nell") was a Japanese bomber and transport aircraft used by the Imperial Japanese Navy Air Service (IJNAS) during World War II. The Mitsubishi 1MT was a Japanese single-seat triplane torpedo bomber built by Mitsubishi for the Imperial Japanese Navy Air Service.  Designed by the former Sopwith designer Herbert Smith it was intended for use aboard the Japanese aircraft carrier "Hōshō" . The Aichi D1A or Navy Type 94/96 Carrier Bomber (Allied reporting name "Susie") was a Japanese carrier-based dive bomber of the 1930s.  A single-engine, two-seat biplane based on the Heinkel He 50, the D1A was produced by Aichi for the Imperial Japanese Navy, remaining in service as a trainer at the time of the attack on Pearl Harbor.  The D1A was produced in two variants, the D1A1 (Navy Type 94 Carrier Bomber), and the D1A2 (Navy Type 96 Carrier Bomber, sometimes referred to as the D2A.) The Mitsubishi B5M was an Imperial Japanese Navy Air Service (IJNAS) land-based attack aircraft, originally intended for carrier use.  The B5M was also given the long formal designation 九七式二号艦上攻撃機 - Navy Type 97 No.2 Carrier Attack Bomber and Allied reporting name of Mabel. The Kugisho B3Y, or Navy Type 92 Carrier Attack Bomber was a Japanese carrier-based torpedo bomber of the 1930s.  It was designed by the Naval Air Technical Arsenal at Yokosuka, and while unimpressive during testing, it was ordered into service by the Imperial Japanese Navy and used until replaced by more capable aircraft. The Yokosuka B4Y, (Navy Type 96 Carrier Attack Bomber), carrier torpedo bomber was used by the Imperial Japanese Navy Air Service from 1936 to 1943.  The B4Y replaced the Mitsubishi B2M2 and was the last biplane bomber used operationally by the Imperial Japanese Navy.  The Allied reporting name was "Jean". The Mitsubishi G4M (long designation: Mitsubishi Navy Type 1 attack bomber: 一式陸上攻撃機, 一式陸攻 "Isshiki rikujō kōgeki ki, Isshikirikkō") was the main twin-engine, land-based bomber used by the Imperial Japanese Navy Air Service in World War II.  The Allies gave the G4M the reporting name Betty.  Japanese Navy pilots called it Hamaki (葉巻 , "cigar", lit.  "leaf roll") due to its cylindrical shape. The Chitose Air Group (Chitose Kōkūtai) was an air group of the Imperial Japanese Navy Air Service during World War II.  The group was formed on 1 October 1939 at Chitose Airfield, Hokkaidō equipped with Mitsubishi G3M Type 96 bombers.  The group was later supplemented with Mitsubishi A5M Type 96 fighters.  In December 1941, it was assigned to support Japanese Navy's 4th Fleet for operations in the central Pacific as part of the 24th Air Flotilla.  It was renamed the 201 Air Group in December 1942.
Answer: 1943