'government assignment' is correct and usable in written English.
You can use it when referring to an assignment related to government matters. For example, "This government assignment requires that I research the history of the US Constitution."
37 CFR § 401.10 - Government assignment to contractor of rights in invention of government employee.
Government assignment to contractor of rights in invention of government employee.
§ 401.10 Government assignment to contractor of rights in invention of government employee.
Mr. Headley said he told the investigators that he was mixing with extremists as part of a government assignment.
This summer, in response to a growing perception of crisis, Obama appointed Kenneth R. Feinberg, a Washington lawyer whose previous government assignment had been supervising the September 11th Victim Compensation Fund, as the country's "special master" on corporate pay.
Perhaps his most important government assignment was to serve as head of the West German delegation to the London debt negotiations (1951 53), which settled his country's foreign debts and set out conditions for establishing its creditworthiness.
I have found at least one alias for him, and he has continued to travel abroad on government assignments, even to Central Asia.
While Mr. Loomis was deeply involved in government assignments from 1950 to 1978, he managed to stay active in his favorite outdoor activities; hunting, sailing, and riding to the hounds with the Middleburg Hunt in Middleburg, Virginia.
In the course of his long career, he undertook a number of government assignments, including the organization of price controls in World War II and speechwriting for Presidents Franklin D. Roosevelt, Kennedy and Johnson.
His connections with Kido and Ōkubo Toshimichi, the other giant of early Meiji Japan, enabled him to undertake government assignments to the United States and the Iwakura Mission to Europe (1870, 1871 73) to study and work on matters as diverse as taxation and budgetary systems and treaty revision.
In Morrison, Justice Scalia suggested that an independent counsel be understood as a principal officer because that coincided better with the understanding that the appointments clause is among the most significant structural safeguards that are designed to preserve political accountability relative to important government assignments.
