For example, when opposed entry is likely, commanders may have to seize and secure airfields and seaports to permit insertion of follow-on forces. Afterwards, it will be necessary to repair damaged facilities in order to process arriving units at the required rate. Even in the event of unopposed entry, ports of debarkation will undoubtedly still require improvement and repair to accommodate high throughput rates required for force closure. [FM 100-17-3]
