Could the time be good for this again?↓↓
If it worked in Vietnam, it would work in the sandbox.
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Project Eldest Son (also known as “Italian Green” or “Pole Bean”) was a program of covert operations conducted by the United States' Studies and Observation Group (SOG) during the Vietnam War. The project focused on placement of exploding cartridges into supplies used by communist combat forces in southeast Asia. United States technicians assembled 11,565 7.62×39mm cartridges for AK-47 rifles, 556 12.7×108mm heavy machine gun cartridges, and 1,968 82mm Type 67 mortar shells to detonate in the weapon when firing was attempted.[1] Project Eldest Son is an example of unconventional warfare. The missions under this program were implemented successfully in Vietnam, Cambodia, and Laos.[2]
The forced-laborer in Germany in WW2 tried (have done) something similar, they sabotaged ammo and sometimes even weapons to explode later in use at the front. It was very difficult for them, a special knowledge was necessary (mostly about tolerance limits) and the stuff was controlled several times.
But there are no exact data about the amount of (successful) sabotage available, too less survivors.