shock troops 
plural noun
Troops trained specially for carrying out a sudden assault: figurative the miners are the shock troops of the British working class...
- Rhino-mounted Bantu shock troops could have overthrown the Roman Empire.
- A lot of people, under the guise of the War Veterans Association, were used as the shock troops to remove the white commercial farmers from their land.
- So we're taken in to this top secrete government building, and go through vigorous training to turn us into the perfect solider, the shock troops of third world countries.
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