The plans also reveal the major American city it was supposed to be tested on is New York City. The Resistance manages to secure a small plane and airdrop Carson over London, launching another attack on the Houses of Parliament to serve as a distraction, in order to put an end to the threat.
The plans show that the test site was supposed to be in New York City.  The Resistance used a small plane to drop Carson into London, where they launched an attack on the Houses of Parliament to distract from their mission and neutralize the threat.