rainfall cuts new york city's comeback concert short. chaos in afghanistan: a firefight erupts at the airport as the taliban warn of consequences if the u.s. stays after august 31 deadline. plus some military rescue mission to help americans stranded in kabul. in our back to school series: mask confusion. what parents are telling cbs news about mask mandates as tens of thousands of students and staff are forced to quarantine. and a heartfelt reunion. 77 years after a soldier saved three children's lives during world war ii. this is the "cbs evening news" with norah o'donnell, reporting from the nation's capital. >> o'donnell: good evening to our viewers in the west, and thank you for joining us, we'll begin with the news that many hope will convince the vaccine hesitant to get their shot: the f.d.a. has given full approval to the pfizer covid vaccine in record time, actually