expeditionary force

n.

（派往国外参战的）远征军；

复数：expeditionary forces

I Marine Expeditionary Force
An expeditionary force
A brief record of the advance of the Egyptian expeditionary force under the command of General Sir Edmund H. H. Allenby ... July 191...
Expeditionary force
...Minorities in the Canadian Expeditionary Force
Meteor Burst Communications for the U.S. Marine Corps Expeditionary Force
Psychological Research in Aviation in Italy, France, England, and the American Expeditionary Forces.
Supporting Air and Space Expeditionary Forces: A Methodology for Determining Air Force Deployment Requirements
THE INFLUENZA EPIDEMIC OF 1918 IN THE AMERICAN EXPEDITIONARY FORCES IN FRANCE AND ENGLAND
Report on the mammals of Mesopotamia, collected by members of the Mesopotamian Expeditionary Force, 1915 to 1919