Ctrl + ALt + B in mission brings up the mission briefing, which is nice.
Industrial Investigation.
Public/Van
An illegal organization built a sleeping cell to lay low in this industrial complex. We must take down these cultists and possibly arrest their leader. To abort the mission return X-Com operatives to the exit area nad click on the 'Abort Mission' icon.
I have Medkits, Flashlights, and flares. No Taser, which are concealable, and I always bring. No Knives, or batons. No guns of any type, even concealable pistols.
Maybe it has to do with how I have kevlar vests for everyone? But there is no data on that in the ufopedia either.
Past that, What vehicles are acceptable for undercover of various types, because extended info doesn't include that. Nor does it for armor, and I assume there are limits there as well.
I need clarification, because these missions appear bugged.
It's not a bug, that mission specifically requires labor gear- and while tasers are concealable they are
not labor gear. You'll want crowbars, knives (the one specifically called "knife", combat knives aren't allowed) wooden clubs (it has to be wooden clubs, electric ones aren't allowed), axes, fire extinguishers, and later on you'll get a nailgun- fortunately most of the enemies in the mission are similarly equipped and a dog can take them out without much hassle. Like I said, go to your inventory and when you get the option to sort it, choose "Labor gear". You'll be given a specific outfit for the mission, which is why the kevlar vests aren't equipped. All this stuff doesn't show in the UFOPedia unless you click on the "More info" button (I think that it was called that, it's a button on the UFOPedia that gives detailed stats about items including stuff you probably won't need to know unless you plan to mod the game yourself).
Acceptable vehicles for most undercover types are vans, the helicopter, and the Land Rover (you won't get that for a very long time either). As for armor, I hope you like leather coats because it'll be the best thing you can bring until you can make bulletproof coats (again, much later on).