CIA Central Intelligence Agency
dog tags identity tags worn by US military personnel
evac short for evacuation
IEDs Improvised Explosive Devices, home-made bombs triggered by remote control
intel short for intelligence
infidels refers to someone without faith, in this case, a non-Muslim
ISAF International Security Assistance Force — the NATO-led mission in Afghanistan
muezzin person at a mosque who leads the call to prayer
mujahedin different groups of Afghan fighters opposed to Russian rule
opium product created from poppies and used in the production of heroin