It’s just big numbers at work. If you have a given percentage of things that are going to fail, as you use more of them you will experience some of those failures. Cluster munitions, m26a1 in the case of what is going to Ukraine, break open and drop a bunch (518) of submunitions (m85 specifically) over an area about the size of a football field. Those submunitions are basically grenades with a small parachute ribbon to arm them. Once they hit the ground they are supposed to detonate. This iteration of munitions also has a time fuse (m235) to scavenge any munitions that don’t detonate when they impact as they are supposed to. Testing has shown a dud rate of less than 1% on these rounds which is much better than many, but still not zero.
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