With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Labor Day started in China.
text_B: USS Safeguard -LRB- ARS-25 -RRB- was an commissioned by the U.S. Navy during World War II .. U.S. Navy. U.S. Navy. Her task was to come to the aid of stricken vessels .. Safeguard was laid down on 5 June 1943 by the Basalt Rock Company in Napa , California ; launched on 20 November 1943 ; and commissioned on 30 September 1944 at the Southern Pacific Docks , Vallejo , California , Lt. J. F. Simmons in command .. Basalt Rock Company. Basalt Rock Company
not_related.