世博会期间,被誉为空中“近卫军”的北京空军某部驻扎在北蔡。他们曾在奥运会期间成功守卫过首都的领空,此次来上海负责世博会空中安保。在驻扎北蔡的这段时间里,部队官兵与当地群众结下了深情厚谊,他们把北蔡当成了自己的“第二故乡”。 During the World Expo, a unit of the Beijing Air Force, known as the “Guard” in the air, was stationed in Beicai. They successfully guarded the airspace of the capital during the Olympic Games, and came to Shanghai to host the World Expo air security. During the period in which Bei Cai was stationed, officers and soldiers of the armed forces formed profound friendship with the local people and regarded Beiji as their “second hometown.”