The phrase "a permanent assignment" is correct and usable in written English.
It can be used when referring to a task or role that is intended to last indefinitely or for a long duration without a predetermined end date.
Example: "After years of temporary roles, she finally received a permanent assignment at the company, which brought her a sense of stability."
Alternatives: "a long-term position" or "a fixed role".
Mr. Gribbon said no decision had been made on a permanent assignment.
In January 1995, he had a permanent assignment in New York, and the two became inseparable.
Under the deal, the union would agree to suspend teacher sabbaticals for a year and permit teachers without a permanent assignment to be used more regularly as classroom substitutes.
To avert the first layoffs of teachers since the financial crises of the 1970s, the union agreed to suspend sabbaticals for a year and to allow teachers without a permanent assignment to work as substitutes in the classroom, possibly in a different school every week, for savings that add up to $60 million.
In 2000 Jobs took the CEO position as a permanent assignment.
After I unpacked my bags and had settled into my permanent assignment for a while I was free, on occasion, to explore what I found to be a beautiful, sometimes exotic, country that lay just beyond the barracks gate.
One turned out to be a mean mincer, so she was placed on permanent assignment.
In the wake of last month's deadly shooting at Los Angeles International Airport, a local congresswoman has called for improvements to airport security, including the permanent assignment of armed police officers near passenger screening checkpoints.
When the picture dwells on dueling ambitions -- Jake's striving for permanent assignment to undercover work and Alonzo's constant conning of his rookie partner -- you lean in to listen.
When the picture dwells on dueling ambitions -- Jake striving for permanent assignment to undercover work and Alonzo's constant conning of his rookie partner -- you lean in to listen.
In late 1878, Tillman became the sixtieth of the founding members of Washington, D.C.'s Cosmos Club, but resigned in 1881, after he was given permanent assignment at West Point as professor of chemistry, mineralogy, and geology.
