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Jamming is just a term meaning the rifle would not work properly. Usually has to do with a feed problem. If the weapon is dirty at all, any problems is has will be magnified.

The M-16, the SAW and the M-60 all must be cleaned and maintained after each use. Some of these weapons are from the Vietnam era and have multiple sources of ware that will cause the weapons to fail if allowed to get dirty.

If you are in a non-direct combat unit, you are not focused on your weapon and don't have the experience of it jamming after an day of hard use.

I will bet that they were issued weapons that were rejects from an infantry unit. This is why the loss of the records is important to saving careers.