Composite armor In general with the counterpoint that density hits a point of futility. That can mean body armor or transparent armor as practical. So a ballistic vest or window will fail after a number of repeated shots to the same panels. The number of shots is though fairly ridiculous depending on protection level a BR7 ballistic glass block like those used in VVIP rides. Like the armored Hongqi L5 that the President of China cruises around in will be rated to about 50 shots of conventional 5.56x45mm.
After that the inner layer has shattered and if it’s not all ready penetrated it’s showering the occupant with shards of glass and about to fail. Body armor is even less because of issues of area of protection (IE you generally have gaps in the armor where you move and don’t have such overlaps of material A to Material B) So where one shot won’t penetrate two won’t either but by beyond this point if you are still taking shots why are you still standing there?
For your example a Light armored vehicle, the view ports will fail first. This as as you can only make ballistic glass so thick before it’s visual distortion makes it impossible to see out. Then goes lighter armored elements. Tracks or wheels, Engine and automotive, Weapons things that make it no longer mission effective IE a mission kill.
Tanks however are the kings of dense. Imagine a vehicle the size of a Full size Pickup truck but 20 times as dense. That’s a Tank. The composite armor is so dense that it’s beyond impractical. But even then if you get one that is just a sitting target and keep hitting it even if it’s proofed against the round used (more practical for tank shells beyond impractical for small arms) eventually it will fail it’s just a question of how many shots and what fails first. Generally the weak point that goes first on a AFV will be the view ports and optics followed by weapons, automotive and engine. It’s happened before, British Challenger and American Abrams tanks drove in to ambushes where in they took huge numbers of hits from everything you can think of short of a tactical nuclear strike. From Bombs to sling shots. In some cases the tanks were disabled and some of the fire power then used on them wasn’t just opposing forces but was allies trying to prevent the enemy from getting a prize. In some cases the vehicle did eventually start burning which is what killed it. Yet in a few cases the Crew remained perfectly safe inside even as it was fired on like target practice.