Which military rifle was infamously recalled during the Vietnam War due to jamming issues that resulted in numerous American casualties?

Throughout military history, equipment failures have sometimes led to disastrous consequences on the battlefield. One particular weapon recall stands out for its impact on combat effectiveness during a major conflict. Test your knowledge of military equipment history with this challenging question about a famous rifle recall that affected troops in combat.

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M16 rifle (early versions)
M14 battle rifle
M1 Garand
M1 Carbine