WASHINGTON, Aug 16 (Reuters) - The Pentagon said on Monday that the airfield at Kabul"s airport had been reopened after a pause earlier in the day. An official from the Joint Staff told reporters at the Pentagon that a C-17 landed earlier on Monday with Marines aboard and another C-17 was expected to land later in the day. Reporting by Idrees Ali and David Brunnstrom Editing by Sonya Hepinstall Our Standards: The Thomson Reuters Trust Principles.