Military personnel could miss out on promotions if they don't do enough to promote an "inclusive culture" in their units.
All personnel will be judged in appraisals for how they have promoted or contributed to that "inclusive culture" as a "Diversity and Inclusivity" will be amongst their objectives.
The joint policy was agreed by the Defence Board in November 2016 and has now been rolled out across the services.
Appraisals are used to determine people's suitability for promotion and are carried out annually by serving personnel's reporting officers.
The Army has recently launched their 'This is belonging' 2018 recruitment campaign, which was seen as an attempt to encourage people of all backgrounds, regardless of ethnicity, gender or sexual preference, to join up.
A compulsory objective has now been added to all appraisals under the heading of Diversity and Inclusion.
The objective for officers, warrant officers and NCOs is to:
"Promote an inclusive culture within area of responsibility, working to increase understanding and engagement through education and initiative."
For other ranks, it is set as: "Contribute to an inclusive culture, treating others with fairness and respect in accordance with Service values and standards."
An MOD spokesperson said: "We added this objective because we are committed to promoting a modern, diverse and inclusive workplace.
"A key part of this is ensuring that everyone in Defence takes the lead."
General Sir Nick Carter, who is currently Chief of the General Staff and will soon become Chief of Defence Staff, has previously spoken about changing the character of conflict and the important role women play in the Armed Forces.
As Chief of the General Staff, he said it was his intention to steer the Army to becoming a “modern, forward-looking employer, which will have no difficulty in recruiting from the broadest-possible talent base”.