Many American job descriptions end with the line “other duties as assigned.” For civilian jobs in the US Army, “the phrase is required for all Army position descriptions.” It “allows supervisors flexibility in assignment of duties.”
The Army also sets limits. The phrase covers “insignificant and non-recurring duties that change frequently,” about 10 percent of a 40-hour week. The duties must relate to the scope of the job. Mission-essential and critical duties belong in the written description itself.