With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Willie Nelson joined the Air Force.
text_B: German submarine U-652 was a Type VIIC U-boat of Nazi Germany 's Kriegsmarine during World War II .. Type VIIC. German Type VII submarine#Type VIIC. U-boat. U-boat. Nazi Germany. Nazi Germany. Kriegsmarine. Kriegsmarine. World War II. World War II. The submarine was laid down on 5 February 1940 at the Howaldtswerke yard at Hamburg , launched on 7 February 1941 , and commissioned on 3 April 1941 under the command of Oberleutnant zur See Georg-Werner Fraatz .. laid down. Keel laying. Howaldtswerke. Howaldtswerke. Hamburg. Hamburg. launched. Ceremonial ship launching. commissioned. Ship commissioning. Oberleutnant zur See. Oberleutnant zur See. Attached to 3rd U-boat Flotilla based at Kiel , U-652 completed her training period on 30 June 1941 and was assigned to front-line service .. U-boat. U-boat. 3rd U-boat Flotilla. 3rd U-boat Flotilla. Kiel. Kiel. In September 1941 she was involved in the `` Greer Incident '' , attacking and being counter-attacked by the supposedly neutral American destroyer , an incident that brought the United States closer to war with Germany .. U-652 was transferred to 29th U-boat Flotilla based at La Spezia , Italy on 1 January 1942 .. U-boat. U-boat. 29th U-boat Flotilla. 29th U-boat Flotilla. La Spezia. La Spezia. Italy. Italy. The U-boat was scuttled on 2 June 1942 .. U-boat. U-boat
not_related.