"field force" is correct and usable in written English.
You can use it when referring to a group of people who are assigned to do a particular job for a specific period of time. For example: "The company enlisted a field force to carry out research in remote villages."
It even has a "Star Wars" name: Field Force Data Visualization.
"We had had growing numbers of requests for it from our field force," she said.
The Field Force, though, refers to the workers, not to the subliminal energy field sensed by the Jedi.
The home field force now uses specialized HTC Fuze phones, Microsoft software, a mobile videoconferencing application from a start-up called iVisit, and the AT&T network service.
The agency at times had as many as five inspectors searching the plant for clues, instead of the typical field force of one or two in routine inspections.
Likely to mutiny if pay was not forthcoming, they were known to abandon the field, force a fight to end a prolonged siege, or, as was the case of the Sack of Rome (1527), take their pay in plunder.
She had reason to believe, if she ever dwelt on such matters, that she was off the hook of prurient speculation into her supposedly aberrant erotic field-force.
The final act's field-force of lights, combined with increasingly urgent amplified music, propelled the work to a powerful climax.
Gen. Mark S. Martins, commander of the military's new Rule of Law Field Force in Afghanistan.
So wrote Winston Churchill about his experiences with the Malakand Field Force in 1897.
Interview with Martin P. O'Connell, superintendent of the Auxiliary Field Force of the Dept. of Sanitation at 22 St. & the East River, to find out about snow removal.
