Department of Defense (USA); Ministry of Defence (UK, etc.); the Pentagon
Refers to the defense ministry or department of a country, especially the US Department of Defense or the UK Ministry of Defence. Can also metonymically refer to the Pentagon.
The US Department of Defense is also called the Pentagon.
イギリスの国防省は新しい防衛計画を発表した。
The UK Ministry of Defence announced a new defense plan.