Fatigue duty

Fatigue duty is the labor assigned to military men that does not require the use of arms. Parties sent on fatigue duty were known in English by the French term "detachemens" according to an 1805 military dictionary.

History
The term is recorded in America in 1776, and in an 1805 British military dictionary.

In the United States, the allowance of soldiers employed at work on fortifications, in surveys, in cutting roads, and other constant labor, of not less than ten days, was authorized by an act approved March 2, 1819, entitled An act to regulate the pay of the army when employed on fatigue duty and paid twenty-five cents per day for men employed as ordinary laborers and teamsters, and thirty-five to fifty cents per day for men employed as mechanics, depending on their location.

Interesting facts (U.S.)

 * U. S. soldiers on fatigue duty were allowed an extra gill of whiskey by the act of March 2, 1819.
 * For a time, United States Marine Corps company grade officers were supposed to wear an English model “pillbox” or “round cap” for fatigue duty but it was never popular.