The tape can be found in Fort Defiance, close to the third floor elevator.
A mental asylum as a last stand against the Scorched. Brave, crazy, and crazy-brave, the Army way... At least, I'm pretty sure the Brotherhood had former US Army members judging by the security systems.
If only they had survived. What I wouldn't give to have a few of America's finest watching my back right now. As it is, I'll have to find out how they were planning to combat the Scorched on my own. Once I can figure out a way through these doors...