Again, don't read if you don't want to know the background and potential solutions to the background and problem faced by the player.
In the near future of 2020 America has fallen, dark forces have taken over the world and the Dark War has ended most of human life. The cause is an American drug created in 2015 to combat sleeper agents from the Anti-American ArcStar Group originating from France with the intention of eliminating the New Age Zero politcal party, and destroying a corrupt America. The drug is AAD-49. And upon finally reaching it's goal of destroying it causes the Fallen Zone to come into existance, which quickly corrupts the host and kills them, turning them into dark strange creatures which hunt normal humans and suck out their blood. The Blood Art organization sends a message to the scientists working with AAD-49, informing them through a fake release for the psuedo-scientists working with the disease, hoping to get a correct outcome for humanity and send the correct data packets to freedom fighters in the future to fight the disease, hopefully creating a vaccine.
Events during the AAD-49 release include extreme sightings of strange Fallen creatures (Strange large creatures with a large black blob for a body and a smaller blob with white eyes for a head, 8 arms with claws. Their skin burns to the touch and is liquidy). This lead to the Clockwork invasion, Fallen creatures in the next stage of evolution. Clockwork Demons can corrupt Earth's atmosphere, making the area more habitable for the Fallen Zone creatures.
AAS-49 Itself was created from a modified Dexos-10 parasite. The hope of creating a cure for Dexos-10 (Which causes symptoms similar with what the government wants caused on it's revolutionaries.) is long past but it is still paramount in Blood Art efforts to save America.
Strike Zones for Fallen Creatures (And thus Clockwork Demons) include: Moscow, London, Paris and Washington D.C.
Operation Blood Angel was launched by the Blood Arts Organization after ArcStar was destroyed by biological Counter Terrorist operations to prevent this future from ever happening. Instead of doing what the Government's Biological Dark Operations Division and launching AAD-49 over a multiple distribution platforms for scientists to engage with they released a double (Covered with messages, including through the forum of which stated strike locations and questions as to whether they can decrypt the message) through an agent of the BAO who doubled for working for a "Plague Inc.". Though he himself cannot see the encrypted messages.
Bit cool, I'm adding to it constantly. This was written while I was pretty fucking sleepy.