Act of War: High Treason is an expansion pack for Act of War: Direct Action. It was developed by Eugen Systems and published by Atari. It was released in the PAL region in March 2006 and in North America on May 30, 2006.
Plot
Act of War: High Treason takes place over the course of three days, three years after the events of Act of War: Direct Action. On the eve of the U.S. Presidential election, the two presidential candidates, Senator Watts and Vice President Joshua Cardiff are attacked. Task Force Talon intervenes and rescues both, but in the meantime, President Baldwin is assassinated. Thus, Vice President Cardiff becomes the new President of the United States. Later, Senator Watts disappears and is announced dead by officials.
In the aftermath, several important government officials and U.S. Army personnel are arrested on conspiracy and assassination charges, but Colonel Whitemore, leader of the military unit in charge of Senator Watts is conveniently not questioned. Task Force Talon tries to meet him in Fort McCoy, Wisconsin, but the U.S. Army forces open fire on the task force units and they are branded as traitors. Task Force Talon tracks Whitemore's C-17 Globemaster transports carrying a shipment of USAMRIID biological barrels to Cancún, Mexico. The recipient is the Consortium, a highly advanced and well-funded shadowy military organization, which was assumed eradicated in the events of the previous game.