Question: The Type 93 and Type 100 Flamethrowers were flamethrowers used during which War?

Context paragraphs:
Type 93 surface-to-air missile: The Type 93 Surface-to-air missile (93式近距離地対空誘導弾 , 93shiki-kinkyori-titaikū-yuūdōdan ) is a surface-to-air missile used by the Japan Ground Self-Defense Force.  It is the vehicle-borne version of the Type 91 missile.

Type 100 submachine gun: The Type 100 submachine gun (一〇〇式機関短銃 , Hyaku-shiki kikan-tanjū ) was a Japanese submachine gun used during World War II, and the only submachine gun produced by Japan in any quantity.  It was made in two basic variants referred to by American and British observers as the Type 100/40 and the Type 100/44, the latter also known as the Type 100 (Simplified).  A third variant was a folding version of the early model, sometimes referred to as the Type 100 Navy, made for parachutists.

Type 93/Type 100 flamethrower: The Type 93 and Type 100 Flamethrowers (九三式小火焔発射機/一〇〇式火焔発射機 , Kyūsan-shiki syō-kaen-hasshaki　/　Hyaku-shiki kaen-hasshaki ) were flamethrowers used by the Imperial Japanese Army and Imperial Japanese Navy's SNLF during the Second Sino-Japanese War and World War II.

Type 97 torpedo: The Type 97 was a 17.7 in diameter torpedo used by the Imperial Japanese Navy during World War II.  Intended for use with Japan's "Ko-hyoteki" class midget submarines, the torpedo was based on the 24-inch diameter Type 93 "Long Lance" used by Japanese surface vessels, but redesigned to meet the smaller 18-inch physical dimensions of the midgets' two torpedo tubes.  Larger Japanese submarines were armed with the 21-inch Type 95 torpedo.

Livens Large Gallery Flame Projector: Livens Large Gallery Flame Projectors were large experimental flamethrowers used by the British Army in World War I, named after their inventor, Royal Engineers officer William Howard Livens.

Second Sino-Japanese War: The Second Sino-Japanese War was a military conflict fought primarily between the Republic of China and the Empire of Japan from July 7, 1937 to September 9, 1945.  It began with the Marco Polo Bridge Incident in 1937 in which a dispute between Japanese and Chinese troops escalated into a battle.  The conflict then escalated further into a full-scale war.  It ended with the unconditional surrender of Japan on September 2, 1945 to the Allies of World War II.

Type 100 Te-Re: The Type 100 Te-Re was an artillery observation vehicle of the Imperial Japanese Army used to spot and recon for SPGs and stationary artillery.  Based on the chassis of the Type 97 Te-Ke tankette, production began in 1940.  The Type 100 Te-Re was able to accommodate a crew of six to eight men as well the observation and radio equipment.  A total of 100 to 150 were produced.  They were mainly used in the Second Sino-Japanese War.

Mark 16 torpedo: The Mark 16 torpedo was a redesign of the United States Navy standard Mark 14 torpedo to incorporate war-tested improvements for use in unmodified United States fleet submarines.  The torpedo was considered the United States standard anti-shipping torpedo for twenty years; although significant numbers of Mark 14 wartime production remained in inventory.  This hydrogen peroxide propelled, 21 inch (53 cm) torpedo was 246 inches (6.25 m) long and weighed 2 tons (1800 kg).  The Mod 0 warhead contained 1260 lb (572 kg) of TPX explosive and was the most powerful conventional submarine torpedo warhead ever used by any Navy.  The United States used TPX explosive which was about 75% more powerful (7405 J/g.)  than the Type 97 explosive in the larger Japanese Type 93 Mod 3.  (780 kg of Type 97, 4370 J/g.)  The Mod 1 warhead contained 960 lb (435 kg) of TPX or HBX (7552 J/g.)  explosive.  The torpedo could be set for straight- or pattern-running.

ROKS flamethrowers: The ROKS-2 and ROKS-3 were man-portable flamethrowers used by the USSR in the Second World War.

SM U-109: SM "U-109" was a Type U 93 submarine of the Imperial German Navy in World War I, taking part in the First Battle of the Atlantic.  The building contract was confirmed 5 May 1916, and was awarded to Germaniawerft, Kiel.  A Type 93 boat, she was launched 25 September 1917 and commissioned 7 November.  She was under the command of Otto Ney.  On 28 January 1918, she was sunk in the English Channel, possibly by a mine, while diving to avoid ships from the Dover Patrol (particularly drifter H.M. Beryl III).  She sank no ships.

Supporting paragraphs: Type 93/Type 100 flamethrower Second Sino-Japanese War
Answer: Second Sino-Japanese War