With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: George Foreman is the only two-time world heavyweight champion.
text_B: NATO targets are a series of standard armoured targets defined by NATO designed to test the armour penetration of weapons .. NATO. NATO. The purpose of the triple heavy target is to represent the difficulty a projectile would face in penetrating the skirt , roadwheel , and hull of a Soviet tank .. They are defined as  :
not_related.