The UKDD provides philosophy and principles underpinning the employment of the armed forces.
The purpose of United Kingdom Defence Doctrine (UKDD) fifth edition is to explain the military instrument of power and its utility both in and beyond warfare. This edition of UKDD refreshes British Defence Doctrine (fourth edition) and, without losing the importance of hard power and excellence in war-fighting, better explains the full spectrum utility of defence.
It also incorporates developments such as the whole force concept and the importance of cyber to the United Kingdom’s security considerations. UKDD should be read by all officers of the armed forces, both in regular and reserve service, and is of particular relevance to officers of mid-seniority and above in command and staff appointments. In addition, it is commended to all MOD civil service personnel.