I really cannot big this film up enough. It is in the same league as Commando. There is no flab in this film. No character, no dialogue, just constant automatic gunfire.
The plot is insane. Random 'terrorists' invade the USA (wierdly gunning down some Cuban refugees on route); it is never explained who they are, what they are doing, or what they want. Scene after scene of terrorists attacking Americans playing baseball, celebrating Christmas, in a church follow. There is one scene where they just drive around a neighbourhood, firing a bazooka into each house!
However, wherever they appear, Norris appears son afterwards and guns them down with a pair of SMGs seemingly attached to his braces. Norris is utterly emotionless, and unfazed by being completely outnumbered by the terrorists, or anything they do. He never looks worried, or even really looks, even when speeding in his pick up truck towards a dozen terrorists firing bazookas (the terrorists always have bazookas in this film).
The film builds to crescendo of lunacy with the National Guard, with about a dozen tanks, in a shoot out in the streets of Miami against about a hundred terrorists. Meanwhile Norris blows the villain out a plate glass window with his own bazooka. And then the film suddenly ends.
Noteworthy is the film's only actress, a sassy reporter, presumably put there to avoid some kind of sexual discrimination claim, who Norris completely ignores.