Use your skills as an elite member of the Secret Service, Counter Assault Team (CAT) to protect the President from an army of zombies and get him to Airforce One.
Use a collection of weapons including Glock 9mm, M4 assault rifle, Heckler & Koch UMP, M240 general-purpose machine gun, SAR-B16 Bullpup Assault Rifle, Franchi SPAS-12 semi-automatic shotgun, Heckler & Koch MG36 light machine gun, AWM bolt action sniper rifle, and the Remington Concealable Sniper Rifle.
The Secret Service has not lost a President since John F Kennedy. They will not lose one on your watch.