this mission is about us army marines fighting to secure the city wall and kill every single enemy in the area after that your us humvees gonna come and pick you up in the meating point you can wathc this mission on youtube check it out :
youtube.com/user/zheera09
if you want the mods here is the mods link:
xm8 assault rifle:http://www.sendspace.com/file/f237hd
army:http://www.mediafire.com/?t5nfhm4ooe8yh6i
ak47 its the original ak47 in the game.
at4:http://www.mediafire.com/?oub11aza7phf4gc