Longman Dictionary of Contemporary English
shock troops
noun
EXAMPLES FROM CORPUS
▪ Against fast moving shock troops such as armoured cavalry this is also true.
▪ Its guitar-twanging shock troops led the charge away from what Ulan Bator had been, and toward what it was becoming.
▪ The shock troops are: Eric, a chartered surveyor with a Doctor Who-length scarf.
▪ The wars of this period presented little opportunity to shock troops fighting on horseback.
Wiktionary
shock troops
n. (shock troop English)
WordNet
shock troops
n. soldiers who are specially trained and armed to lead an assault
Wikipedia
Shock Troops (album)
Shock Troops is the second album, and the first widely distributed, by punk rock band Cock Sparrer. It was released in 1982 on Razor Records.
Shock Troops (film)
Shock Troops is a 1967 French-Italian drama film directed by Costa-Gavras. It was entered into the 5th Moscow International Film Festival. Film producer Harry Saltzman has a "presented by" credit.