A terrorist insurgency turns Iraqi cities into cauldrons of violence, but the Navy SEALs help turn the tide. Street fighting is notoriously chaotic, confusing and violent, but the SEALs expertise in small-unit tactics, physical endurance and sheer grit make them an invaluable asset to the U.S. Army and Marines. Teaming up with conventional forces, the SEALs participate in "clear-and-hold" operations against a determined, ruthless foe: Al-Qaeda in Iraq.