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The first production unit of the replacement fuze was approved through the National Nuclear Security Administration's rigorous Quality Assurance Inspection Procedure in March.

If a pressure fuze is installed, 150 kg of mass on the fuze is required to trigger it.

The fuzes on the grenades released by the M864 are designed to explode when they hit hard targets like armored vehicles and bunkers, Mr. Vosburgh said.

With pliers and other hand tools, the soldiers must gently probe and manipulate the fuze’s inner mechanisms to disable both of its safety features.

The Mark-80 warhead, which was developed soon after World War II, was designed to be easily fitted with a variety of tail fins and fuzes for use in a range of situations.