I am working on completing the Venus man hunt for this week. For some reason I do not have access to the DARPA Research Lab storymode. I ran the storyline mission for The Pentagon more than once and I also beat it on normal and hard mode and yet still can not access the DARPA Research Labs. Of note I got credit 1/1 for The Pentagon for the Venus Manhunt. If this is helpful, I did run the storyline mission for The Pentagon on my PS4 Pro and switched to my other PS4 after.