Born to a middle-class family, Daniel Slate enlisted with the British Army in his early twenties in the year 2000 and worked his way up to Pegasus Company, the Parachute Regiment's training ground in Catterick.
After passing selection and training, he was eventually assigned to the 3rd Battalion, Parachute Regiment (3 PARA) due to his excellent record from the battalion's previous operations during the Iraq War. This also earned him a promotion to the rank of Sergeant, and an opportunity for even more specialised training.
With the onset of Operation Arrowhead in the Green Sea Region nation of Takistan in 2012, Slate was given command of a paratrooper squad, callsign Lancer Blue.
After several more months of routine counter-insurgency operations in Takistan, the country begins to spiral into chaos again due to bitter infighting between government forces and the regional warlords. Slate becomes jaded with the seemingly futile situation of the country and eventually requests a transfer to provide humanitarian aid to the recent South Zagorian infection outbreak.
Upon arrival, the scale of biological disaster was unprecedented, forcing the UN to withdraw from the cities towards the boarders and declared South Zagoria a quarantine zone, on a scale similar to Chernobyl and Fukushima.
The new plan was to withdraw from the cities to the boarders to contain the infection to the area and starve out the infected. But after speaking to the soldiers in the CDF about their families and people surviving in the cities by themselves, Slate requested to the CO to help assist in evacuating with the growing rate of infected. Slate, frustrated, decided to leave the British Army and personally help the CDF find and evacuate survivors.