With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: California is perfectly at sea level.
text_B: The 551st Electronic Systems Wing -LRB- 551 ELSW -RRB- is a wing of the United States Air Force whose focus is on ` behind the scenes ' electronic work .. United States. United States. United States Air Force. United States Air Force. wing. Wing ( air force unit ). Located at Hanscom Air Force Base , Massachusetts , they work on AWACS , Joint STARS , MP-RTIP , Mission Planning , and weather systems .. Massachusetts. Massachusetts. Hanscom Air Force Base. Hanscom Air Force Base. Now responsible for the development and sustainment of command and control systems , the 551st ELSW takes its designation from a wing that laid the foundation for modern-day airborne surveillance .. wing. Wing ( air force unit )
not_related.