While playing Peru Campaign - Peruvian Gold mission, I can get all the way to the end and the last objective is to hold the LZ until Black Widow arrives for extraction. I defeat everyone around the LZ but then nothing happens. The game doesn't freeze as I still have free movement and firing capabilities. But I just sit there at the LZ and nothing happens. Black Widow never arrives and I can't figure out what else to do. Anyone else having this problem or know how to fix? Thanks.