Question: HMCS "Buctouche" was a Flower-class corvette that served in which organization, during the Second World War, she served primarily in the Battle of the Atlantic as a convoy escort?

Context paragraphs:
HMCS Smiths Falls: HMCS "Smiths Falls" was a modified Flower-class corvette that served in the Royal Canadian Navy during the Second World War.  She fought primarily in the Battle of the Atlantic as a convoy escort.  She was named for Smiths Falls, Ontario.  She was the last Flower-class corvette to enter service with the RCN.

HMCS Snowberry: HMCS "Snowberry" was a Flower-class corvette that was originally built for the Royal Navy, but spent most of the war in service with the Royal Canadian Navy.  She fought primarily as a convoy escort during the Second World War.  She served primarily in the Battle of the Atlantic.

HMCS Wetaskiwin: HMCS "Wetaskiwin" was a Flower-class corvette of the Royal Canadian Navy that served during the Second World War.  She served primarily as a convoy escort in the Battle of the Atlantic.  She was named after the city of Wetaskiwin, Alberta.  "Wetaskiwin" was the first Pacific coast built corvette to enter service with the Royal Canadian Navy.

HMCS Norsyd: HMCS "Norsyd" was a modified Flower-class corvette that served with the Royal Canadian Navy during the Second World War.  She served primarily in the Battle of the Atlantic as a convoy escort.  She was named for North Sydney, Nova Scotia, her name being a contraction of the city's name.  This was due to a naming conflict with a Royal Australian Navy vessel.  After the war she served as a merchant ship and then as a corvette in the Israeli Navy.

HMCS Rosthern: HMCS "Rosthern" was a Flower-class corvette that served in the Royal Canadian Navy during the Second World War.  She served primarily in the Battle of the Atlantic as a convoy escort.  She is named for Rosthern, Saskatchewan.

HMCS Dauphin: HMCS "Dauphin" was a Flower-class corvette that served in the Royal Canadian Navy during the Second World War.  She served primarily as a convoy escort in the Battle of the Atlantic.  She was named for Dauphin, Manitoba.

HMCS Buctouche: HMCS "Buctouche" was a Flower-class corvette that served in the Royal Canadian Navy (RCN) during the Second World War.  She served primarily in the Battle of the Atlantic as a convoy escort.  She was named for Bouctouche, New Brunswick.

HMCS Kenogami: HMCS "Kenogami" was a Royal Canadian Navy Flower-class corvette that served during the Second World War.  The corvette served primarily in convoy escort duties during the Battle of the Atlantic.  Following the war, the ship was sold for scrap and broken up.

Battle of the Atlantic: The Battle of the Atlantic was the longest continuous military campaign in World War II, running from 1939 to the defeat of Germany in 1945.  At its core was the Allied naval blockade of Germany, announced the day after the declaration of war, and Germany's subsequent counter-blockade.  It was at its height from mid-1940 through to the end of 1943.  The Battle of the Atlantic pitted U-boats and other warships of the "Kriegsmarine" (German navy) and aircraft of the "Luftwaffe" (German Air Force) against the Royal Canadian Navy, Royal Navy, United States Navy, and Allied merchant shipping.  The convoys, coming mainly from North America and predominantly going to the United Kingdom and the Soviet Union, were protected for the most part by the British and Canadian navies and air forces.  These forces were aided by ships and aircraft of the United States from September 13, 1941.  The Germans were joined by submarines of the Italian Royal Navy ("Regia Marina") after their Axis ally Italy entered the war on June 10, 1940.

HMCS Levis (K400): HMCS "Lévis" was a River-class frigate that served with the Royal Canadian Navy during the Second World War.  She served primarily as a convoy escort in the Battle of the St. Lawrence and the Battle of the Atlantic.  She was the second ship to bear the name of "Lévis", the first being a Flower-class corvette that had been sunk earlier in the war.  She was named for Lévis, Quebec.

Supporting paragraphs: HMCS Buctouche Battle of the Atlantic
Answer: Royal Canadian Navy (RCN)