My game spiraled into disaster. I did figure out how the mission abort works... but it's buggy. Most of the time the extraction zone doesn't show up. I can usually get it back by quitting out and reloading the save but that's a pain. At the end it wasn't pretty. 6 rookies with a couple of laser rifles between them, all with nanotech vests and carapace armor vs tons of Mutons and Cyberdiscs. As they got slaughtered I tried building some Alloy Shivs with lasers to mix in with the cannon fodder rookies, but they promptly got into the field and all missed multiple 70% shot opportunities and got overrun.
I for one welcome my new alien overlords.