call of duty 4: modern warfare is a great modern day first person shooter with great weapons perks online gameplay
the second person you meet is pvt jackson[i think] who fight for the us marine corps who tragically dies in a nuclear explosion.
every second mission you change players and do missions in different parts of the world versing different enemies the 2 enimies are the russians [stetznas] and the terrorists [opfor/operational forces].
towards the end of the game the british sas and the usmc join forces to defeat the enimie and stop the easter seabord of america bieng nuked.
the only part of this game i didnt like is that all the maps are diferentials from single player levels and that there are weapons and attachments in single player that have been changed in multiplayer.
e.g. the g3 in singleplayer is fully automatic but single shot in multiplayer
the red dot scope in singleplayer is changed to a reflex scope in multiplayer