With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The human condition is analyzed in belief systems.
text_B: The Sigma I-62 war game , played in February 1962 , was the first of a series of classified high level war games played in the Pentagon during the 1960s to strategize the conduct of the burgeoning Vietnam War .. classified. Classified information. war games. Wargaming. the Pentagon. the Pentagon. Vietnam War. Vietnam War. These simulations were designed to replicate then-current conditions in Indochina , with an aim toward predicting future foreign affairs events .. Indochina. Indochina. The conclusion drawn from Sigma I-62 was that American intervention in Vietnam would be unsuccessful .
not_related.